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Globally, Cửu (Cửu ) is a very rare largely boy's, but seldom girly first name. The forename Cửu is habitual in South-eastern Asia, particularly Vietnam, where it is a very rare largely boy's, but seldom feminine name. Also, Cửu is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Cửu | Vietnam |