From Japanese 巌/巖
(iwao) meaning "rock, crag, boulder". It can also be formed from 岩
(iwa) meaning "cliff, rocks" combined with 夫
(o) meaning "man, husband", 男
(o) meaning "male, man, son", 雄
(o) meaning "hero, male, manly" or 尾
(o) meaning "tail, foot, end", as well as other kanji combinations.