Family name Jai (Jay 
, Jai , جاي 
, among others...) , around the globe, is a widespread last name. The family name Jai is habitual in Brunei, where it is quite a common surname, British Virgin Islands, and Jamaica (explore the name in all countries). In absolute terms, the name is most common in India, Indonesia, and the United States. More frequently, Jai is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jay, Jai | Indonesia, Philippines, United States, India, Myanmar |
| جاي | Saudi Arabia, Sudan, Algeria, Egypt, Libya |
| ジェイ | Japan |
| Джей | Russia, Kazakhstan, Ukraine, Belarus |
| ג'יי | Israel |
| janak raj jai (b. 1931) |
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| rikki jai Trinidad and Tobago musician |
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| jai ram singh jai Indian politician, IN |
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| benchiao jai Ph.D. New York University 1999 |
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| ajna jai actress |
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| shrikant jai researcher |
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| abdlehaq el jai Ph.D. |
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| chris jai alex American actor, US (b. 1982) |
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| ise isan jai |
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| abdelhaq el jai MA |
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| younes el jai (b. 1990) |
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Ho, Gopal, Verma, Yadav, Mishra, Sankar, Sharma, Kumari, Kishan, Pandey, Prasad, Ganesh, Thakur, Tiwari, Narain, Shankar, Chauhan, Bhagwan, Krishna, Krishan, Parkash, Prakash, Gupta, Lakshmi, Patel, Karan, Sah, Pal, Ram, Raj, Rai, Dev, Das, Lal, Lee, Jha, Mala, Shah, Shri, Devi, Deep, Jain, Hind, Saini, Shree, Singh, Chand, Kumar, and Narayan