Globally, Ooiwa (オオイワ , Ooiwa ) is an extremely rare unknown gender given name. Very seldom, Ooiwa is the last name as well as the forename.
Ohiwa, Oiwa, and 大岩
Aiko, and Hiroyuki
, Ooiwa 
) is an extremely rare unknown gender given name. Very seldom, Ooiwa is the last name as well as the forename.