All around the world, Iwamatsu (Iwamatsu
, Мако
) is a rare largely male, but infrequently feminine given name. The forename Iwamatsu is characteristic of Bulgaria, where it is quite a rare masculine name, Kazakhstan, where it is a rare epicene name, and China, where it is an extremely rare masculine name. Likewise, Iwamatsu is the last name as well as the forename.