Surname Vai (Bai 
, Vai 
, Bá 
) , around the globe, is a prevalent family name. The last name Vai is characteristic of India, where it is a widespread surname, Cayman Islands, where it is a common surname, and China, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, it is the most numerous in India, China, and Bangladesh. Much less frequently, Vai is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Bai | China, Saudi Arabia, India, Pakistan, Bangladesh |
| Vai | Indonesia, China, Saudi Arabia, India, Bangladesh |
| Bá | Vietnam, Myanmar, United States, India, France |
| Vae | China, Indonesia, Saudi Arabia, United States, India |
| stefano vai (b. 1592) |
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steve vai American guitarist, US (b. 1960) |
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vai sikahema former American football running back-kick returner, US (b. 1962) |
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| vai nāgarāju (b. 1905) |
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vai taua American football player and coach (born 1988), US (b. 1988) |
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antonia vai Swedish/Hungarian singer-songwriter, musician and music producer, SE (b. 1988) |
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vai toutai Australian rugby league footballer, AU (b. 1993) |
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| vai peua New Zealand politician, NZ (b. 1950) |
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| vai gooding French politician, FR (b. 1959) |
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| yoel vai Indonesian musician, ID (b. 1970) |
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| barbara del vai cyclist, IT (b. 1973) |
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| i. vai researcher |
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| vai s lor researcher |
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| alex t vai researcher |
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| marina vai researcher |
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