OkuhashiJapanese Oku means "inside, interior" and hashi means "bridge".
OkuiJapanese Oku means "interior, inside" and i means "well, mineshaft, pit".
OkukawaJapanese (Rare) Oku means "interior,secluded,further out" and kawa means "river". Minako Okukawa is a fictional character from Yuri!!! On Ice and it's also the name of a company.
OtsuJapanese O means "big, great" and tsu means "harbor, seaport".
ŌtsuboJapanese From Japanese 大 (o) meaning "big, great" and 坪 (tsubo), a traditional unit of measurement equivalent to approximately 3.306 square metres.