The Favreau Clan that's stationed in Japan. Clockwise - Rin/Renée, Sachiko/Véronique, Koyomiko/Miko Takino, Hayato/Géraud.
One of the first things to happen when one is initiated into the NKP is the registration of a Hunter Name. This name is based on an alias (originally the middle name – if no middle name is given, the Hunter can choose another name) and the surname used by the oldest member in their lineage (this automatically decides which Clan they are associated with).If they are the first member, they are added to the database in a completely new file, signaling the start of a new clan.
Clans usually stick together in the same area, but as time went on and people immigrated, the rules were loosened up and relocated members had the choice of either starting a new branch of their Clan or joining up with another.
People who have been trained by Hunters before initiation are automatically placed within that particular Clan station due to an Adoption Clause from the old days (when members would raise orphans as their own).
~Demon Hunters: Who Are They? / NKP Culture (from my World Bible)
That alone pretty much explains so much about this picture xD I tend to get REALLY detailed in my world-building entries.