Family name Kayastha (Kayastha 
) , all around the world, is a common last name. The cognomen Kayastha is characteristic of Nepal, where it is quite a common surname, Qatar, where it is quite a rare surname, and United Arab Emirates, where it is a rare surname. In absolute terms, the name is most common in Nepal, India, and the United States.
| VARIANT | COUNTRY |
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| Kayastha | Nepal, United States, India, Qatar, Australia |
| bakul kayastha mathematician (b. 1401) |
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arvind mohan kayastha Indian scientist, IN (b. 1960) |
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| darpan kayastha researcher (ORCID 0000-0003-2106-2967) |
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| arvind m kayastha researcher (ORCID 0000-0002-5090-7159) |
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| neha kayastha researcher (ORCID 0000-0002-5638-7748) |
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Mr, Aaak, Ajay, Ajit, Cpoi, Boby, Bina, Kate, Ranu, Raju, Atul, Ravi, Renu, Rina, Rita, Ritu, Geet, Gita, Gyan, John, Jeet, Rabi, Atit, Agni, Amol, Ms, Nk, Om, Sri, Smt, Ken, Ram, Raj, Jay, Ved, Sabi, Smti, Anna, Annu, Anil, Anup, Anuj, Anju, Abhi, Amar, Amit, Juhi, and Jina