It doesn't mean anything in Japanese. I know because Omi is my name, and I've thoroughly looked into it ;)
it means: samoan/mexican((:
ALL or EVERY
In Korean, "omi" (엄이) means aunt on your mother's side. It is the term used to address and refer to your mother's sister.
Omayra Omi Torres goes by Omi.
Omi Vaidya is 164 cm.
Toshinori Omi is 177 cm.
Koji Omi was born in 1932.
Omayra Omi Torres is 5' 5".
Omi Vaidya was born on 1982-01-10.
Omi Gurung was born on 1986-02-24.
Yusuke Omi was born on 1946-12-26.
Omi Sato was born on 1975-12-22.