A male given name of historical usage

a name (word or phrase indicating a particular person, place, class, or thing) / (more specifically) a given name (excluding the surname)

historic, historical / already-happened, past / former, old, traditional

A male given name of historical usage

history / the study of history

a fountainhead (source of a river) / a source, origin

"Historical kana usage", a prescriptive method of using kana to write Japanese. Devised in the Edo period by Keichū (契沖) and taught in schools until 1946, it aims to be etymologically faithful and reflects earlier stages of the language (Heian period and earlier).

fountainhead / source, origin / Short for 源氏 (Genji): Minamoto clan

a source, origin

a surname, especially those who are descendants of Emperor Saga