My mother used to say “I don’t know the answer to that, but I know where to find it!”
(She was a librarian.)
So, no, I don’t have any references for Japanese names – but I know where to find them! 😀
The lovely heralds over on Facebook’s SCA Heraldry Chat group reccommend the following:
Name Construction in Medieval Japan
From the vendor: Written by “Solveig Throndardottir” (aka Dr. Barbara Nostrand), a large compilation of historical Japanese names – forenames, surnames, nicknames, their meanings, and the appropriate Japanese ideographs.
I also found some web resources which might be helpful.
”Japanese Names” on An Online Japanese Miscellany, by Nihon Zatsuroku[Link]
A list of pre-1600 Japanese name resources
by Issendai (who appears to be a SCAdian…)
A Long History of Japanese Names, Part II: [Link]
The Costume Museum (Kyoto) – Heian Period: [Link]
History of the Kimono, Part II, Nara and Heian: [Link]