The name Umi is a boy's name of Hawaiian origin meaning "tenth".

Notably borne by Umi-a-Līloa, a fifteenth century supreme ruler or high chief of Hawaii, Umi is comes from the word for "tenth". The legendary king was considered just and responsible for uniting the Hawaiian island, having come into power after killing his brother, to end a brutal reign.
 
While Umi is a masculine Hawaiian name, it is a feminine choice from its Japanese and Indonesian roots.

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Hawaiian

The name Umi is a girl's name of Japanese, Indonesian origin meaning "sea; mother".

Two Syllable Names for Girls

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Stylish and simple, Umi is an ocean inspired Japanese name that may appeal to those who enjoy Lumi, Rumi, and Una. It appears in the popular anime series, Love Live
 
Umi might also be used as an Indonesian and Malay name, ultimately deriving from the Arabic umm meaning "mother". While the Japanese name would be pronounced as OO-MEE, the Indonesian form would be said with a shorter oo sound, as in took. 
 
Coinciding with the Hawaiian word for "tenth", Umi is notably borne by actress Umi Myers, artist Umi Dachlan, and voice actress Umi Tenjin.

Umi

Umi Origin and Meaning