Hector Martin

Is he russian? Github says he's from Tokyo (and his repos have Japanese writing).

Not sure; he writes his name in Cyrillic and his, er, interactions on kernel mailing lists don't particularly strike me as typical Japanese. I think he might be an expat living in Japan?

Perhaps. I just got curious because the name isn't Russian at all, but could sound Japanese with proper accents.

He romanizes it as Budi Rachmanto on headers. Indonesian? Definitely not a Japanese name.

No that's definitely a Slavic-origin name, or at least a partial abbreviation of one.

All the hits I'm getting for Rachmanto are for Indonesia, hence my guess.

Seeing Budi Rachmanto & the http://are.ma  domain makes me guess they are Indonesian and originally from Malang, East Java. (Arema is a common abbreviation for Arek Malang = People of Malang)

A second search tells me someone by that name, from Malang, was a student in Japan in 2009. And now I'm creeped out by how efficient I am at cyberstalking. (I know the Arema thing because I lived in Malang for 6 months, 15 years ago.)