The Missing Sons: The Genealogical Gap in the Funakoshi Family
Everyone who approaches the history of modern karate encounters the same familiar triangle: Gichin Funakoshi, the Okinawan schoolteacher who brought the art to Tokyo; Gigō, his third son, the short-lived genius who gave karate greater mobility and fighting distance before dying of tuberculosis at the age of thirty-nine; and the Shōtōkan, the building one of them created and the fires of war destroyed. It is a well-told story, supported by firm dates and sources that confirm one another without apparent contradiction. And then one tries to reconstruct the complete Funakoshi family tree, and that well-told story begins to fall apart in one’s hands.
What no one disputes
Let us begin with the firm ground, because it does exist, and there is more of it than might initially appear.
Gichin Funakoshi (1868–1957) married a woman named Gozei. This is not an insignificant detail: for years, the name “Machi,” along with other variations, has circulated within the Spanish-speaking karate world. The Japanese-language Wikipedia, however, states it unambiguously:
妻、ゴゼイとの間に３男２女がある
“With his wife Gozei, he had three sons and two daughters.”
That sentence already contains the first clue to the problem that follows: the most authoritative Japanese-language source says that there were three sons. Keep that number in mind.
Two of those sons are documented down to the administrative details.
Giei, also known as Yoshihide, was the eldest son, born in 1900 and deceased in 1961. This information does not come from an amateur blog. It appears on the official website of the Shōtōkai, the organization founded by Funakoshi himself and later presided over by Giei as its second-generation leader following his father’s death. When the successor institution publishes dates on its own website, those dates deserve serious consideration.
Gigō, also known as Yoshitaka, was the third son and by far the most famous. He was born on 21 October 1906 and died on 24 November 1945. These dates are independently confirmed by the Japanese and English versions of Wikipedia, Wikidata and even more recent projects such as Grokipedia. Four separate sources agreeing on the same information is a luxury in everyday historical research.
It is also firmly established that he married a woman named Fujiko and had a son named Yukio. Yukio’s existence is confirmed by the caption of a photograph taken at the 1945 funeral, in which he is described as “holding his father’s portrait.” Incidentally, this means that a tradition circulating in certain circles, according to which Gigō’s wife was named “Teruko,” must be corrected: no source has been found that supports that name.
Up to this point, everything fits together. The problem begins in the gap between Giei, the first son, and Gigō, the third.
The missing son—or the surplus sons
If Giei was the first son and Gigō the third, the simplest arithmetic demands the existence of a second son somewhere between them. This is where the sources, instead of confirming one another, begin to contradict each other.
A specialist Spanish-language blog—which appears to translate or draw upon respected English-language authors such as Graham Noble and Steve Cattell, both serious historians of early karate—offers the following genealogy:
“In 1900, his first son, Giei, was born… and in 1901 he had a daughter named Tsuruko, also known as Oto. The Funakoshi marriage would later have three more sons: Giyu, also known as Yoshio; Gigo or Giko, also known as Yoshitaka; and Giketsu.”
Notice the detail that may also solve another, smaller mystery. For years, the idea has circulated that Funakoshi had two daughters named “Tsuru” and “Uto,” names that appear separately in some amateur forums. This source suggests that they were actually the same person: Tsuruko, with Oto as an alternative reading or form of her name.
It would be a classic case of a child being accidentally duplicated through transliteration—the sort of error that proliferates when a biography travels from Okinawa to Tokyo, from Tokyo to the United States and from the United States to Spanish-language internet forums, with each stop adding another layer of noise.
Yet the same source that appears to solve the problem of the daughter creates a new one concerning the sons: it gives four sons, not three—Giei, Giyu, Gigō and Giketsu.
A discussion thread published in 2009 on the specialist forum e-budo.com raises the total to “six children”: four sons and two daughters, with Tsuru and Uto once again treated as two separate people. However, the author of the thread presents the matter as an open investigation rather than an established fact. “I will keep digging!” he writes.
He speculates that the two unknown sons, Giyu and Giketsu, may have died during the Battle of Okinawa in 1945 without ever having moved to mainland Japan. This would explain why sources focused on the history of karate in Tokyo never mention either of them by name.
We are therefore left with three incompatible versions:
- Three sons and two daughters, according to the Japanese-language Wikipedia, although the second son is not named.
- Four sons and one daughter, according to the Spanish-language blog, which resolves the apparent duplication of the daughter.
- Four sons and two daughters, according to the specialist forum, although the claim is openly presented as speculative.
None of these sources provides a birth date, a date of death or a single verifiable anecdote concerning either “Giyu” or “Giketsu.” They exist merely as names floating through second-hand genealogies, unsupported by any surviving documentary anchor.
Why this is not merely an antiquarian obsession
One might assume that pursuing the name of a son who may not even have existed is the kind of scholarship that interests only the most obsessive researchers. Yet the Funakoshi case offers a broader lesson about how the historical memory of individuals who became famous outside their original context is created—and how it is lost.
Everything we know with certainty about the Funakoshi family comes through a single chain of transmission: those relatives who entered the recorded history of karate in Tokyo.
Giei is remembered because he became president of the Shōtōkai. Gigō is remembered because he transformed karate technique and later became the subject of a commemorative volume. They are known because an institution with a direct interest in preserving their memory—the Shōtōkai itself—continued to exist after 1945 and continued writing about them.
Any child who did not enter that chain of transmission—because he died young, remained in Okinawa, did not practise karate or failed to survive 1945—would simply have had no one to preserve his memory in writing.
It is not necessarily that history deliberately forgot him. He may never have entered the system that produces historical documents in the first place.
Between April and June 1945, Okinawa was precisely the kind of place where it was easiest for a person to disappear in this manner. The battle that devastated the island killed, according to commonly cited estimates, approximately one third of its civilian population. Along with those lives, archives, family records, gravestones and entire collections of personal memories were also destroyed.
If two of Funakoshi’s sons died there without ever having established themselves in mainland karate, it would be entirely plausible that not even a date survives for either of them.
In other words, the gap in the Funakoshi genealogy may not be merely the result of poor research. It is probably a genuine scar left by history—the void created by a war that destroyed not only lives, but also the very possibility that those lives would ever be recorded.
A smaller question that was resolved—and why it matters
Amid this greater uncertainty, one smaller question did produce a reasonably clear answer: the precise date on which the Shōtōkan dōjō was destroyed during the air raids of 1945.
Two versions had circulated, one placing the destruction in March and the other in April. The combined evidence—the documented relocation of the family to Koshikawa “in the spring of 1945,” together with a source that specifically dates the air raid to 29 April—tips the balance quite clearly in favour of April.
This is a small but instructive example of the difference between the two kinds of gaps that appear when researching lesser-known historical figures—or, in this case, the relatives of major historical figures.
Some gaps can be resolved through further investigation because the information survives somewhere in an archive and simply needs to be located and compared correctly.
Others may never be resolved because the document that could settle the matter—assuming that it ever existed—disappeared along with the people it described.
The book that probably contains the answer—and that almost no one can easily read
One final detail deserves mention because it clearly illustrates the limitations of conducting open online research in 2026.
There is a book titled Funakoshi Yoshitaka Tsuitōroku (船越義豪追悼録), a commemorative volume published by the Shōtōkai in December 2004 to mark the sixtieth anniversary of Gigō’s death. It is formally catalogued by both the National Diet Library of Japan and the academic database CiNii.
It is almost certainly the document most likely to contain a complete family genealogy, compiled by the organization that had both the greatest interest in preserving it and the most direct access to surviving members of the family, some of whom were still alive in 2004.
At the same time, however, it is a restricted-circulation publication—hi-baihin, meaning “not for sale”—produced for members of an association rather than for the general public. It has not been digitized in any open repository.
The book exists. It is properly catalogued. Yet anyone without direct contact with the Shōtōkai, or without the ability to visit a library in Japan in person, cannot currently read what it contains.
And so, in 2026, the genealogy of one of the most frequently cited families in the history of twentieth-century martial arts ends where so much family microhistory ends: inside a book that exists on a shelf in Tokyo, waiting for someone with sufficient patience—and the right journey—to discover whether Gichin Funakoshi’s second son ever had a name that someone thought to record.
