Proper noun
Okuma (plural Okumas)
A surname from Japanese.
Berlo and Phillips, p. 87 Jamie Okuma ( Luiseño Shoshone Bannock ) has won top awards with her beaded dolls, which can include entire families or horses and riders, all with fully beaded regalia. Source: Internet
Dr. Okuma, working independently, did the same thing with success. Source: Internet