What does "aino" mean?

Aino: One of a peculiar race inhabiting Yesso, the Kooril Islands etc., in the northern part of the empire of Japan, by some supposed to have been the progenitors of the Japanese. The Ainos are stout and short, with hairy bodies. AIN'T Ain't. A contraction for are not and am not; also used for is not. [Colloq. or llliterate speech]. See An't.