Cognomen Joo (Joo 
, جو 
, ジョー 
) , all over the world, is a common surname. The last name Joo is habitual in Malaysia, where it is quite a common surname, Hungary, and Egypt. Likewise, Joo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Joo | Egypt, Malaysia, Portugal, South Korea, Hungary |
| جو | Egypt, Syria, Sudan, Iraq, Saudi Arabia |
| ジョー | Japan |
| Йоо | Russia |
Chao, Chau, Chiau, Chiu, Choo, Chou, Chow, Chu, Châu, Chû, Ciu, Cow, Jew, Jhoe, Jo, Joe, Jou, Joò, Joó, Joô, Joõ, Joō, Joő, Ju, Juu, Jòo, Jòó, Jòô, Jóo, Jóò, Jóó, Jóô, Jôo, Jôô, Jôõ, Jõo, Jõô, Jõõ, Jōō, Jŏŏ, Jőõ, Jőő, Jǿǿ, Tchou, Zhou, Zhu, Zhōu, Zoo, Zu, Ču, Ĵoo, Ĵòó, Ĵóõ, Ĵóő, Ĵôô, Ĵõõ, Ĵŏŏ, Ĵőő, Ĵǿǿ, Джу, Жоо, Чжоу, Чжу, Чу, ג'ו, ג'ואו, تشو, جوو, จู, จูไขหล่อ, しゅう, ジュ, ジョオ, チュ, チュー, 周, 周氏, 朱, 朱氏, and 주
| yi ah joo (b. 1899) |
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hyung-ki joo British musician, GB (b. 1973) |
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judy joo Television chef (b. 1974) |
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| alejandro valencia joo CL (b. 1919) |
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brian joo South Korean musician, US (b. 1981) |
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| jaromír joo HR (b. 1926) |
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| joo don-sik South Korean politician (1937–2022) (b. 1937) |
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johnny joo American photographer (b. 1990) |
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| joo ryon-chang badminton player, KP (b. 1950) |
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| jaromír joo Czech actor, CZ (b. 1955) |
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| manuel cortez joo (b. 1946) |
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| joo young-teak South Korean TV director (b. 1960) |
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| jaromír joo CZ (b. 1952) |
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| michael joo American artist, born 1966, US (b. 1966) |
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| seung-ho joo (b. 1959) |
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