Across the world, Kastytis (Kastytis 
) is a rare masculine first name. The given name Kastytis is characteristic of Lithuania, where it is quite a rare masculine name, the United Kingdom, where it is a very rare boy's name, and the United States, where it is an extremely rare mostly masculine, but seldom girly name. Very seldom, Kastytis is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Kastytis | Ireland, France, United States, United Kingdom, Lithuania |
| kastytis juozas dundulis LT (b. 1941) |
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| kastytis vincentas girdauskas LT (b. 1943) |
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| kastytis vainauskas Lithuanian politician, LT (b. 1961) |
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| kastytis kerbedis Lithuanian singer, LT (b. 1963) |
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| kastytis klimas Lithuanian sprinter, LT (b. 1969) |
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| kastytis barisas LT (b. 1961) |
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| kastytis beitas LT (b. 1962) |
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| kastytis mačiulis Lithuanian association football player, LT (b. 1975) |
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| kastytis celiesius Lithuanian athletics competitor, LT (b. 1978) |
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| kastytis šmigelskas researcher (ORCID 0000-0001-5371-9500) |
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Tys, Gaigalas, Gedminas, Norvilas, Norvaisa, Vaitenas, Zymantas, Žuromskas, Žukauskas, Sarnickas, Balciunas, Belazaras, Lazauskis, Normantas, Miliauskas, Kazlauskas, Tamulaitis, Endriukaitis, Skvarnavičius, Kavaliauskas, Rimkevicius, Matulevičius, Rimkevic, Kvietkauskas, Kozlovas, Soliunas, Ius, Ciuma, Jucas, Trota, Nefas, Mockus, Alekna, Bubele, Kaleda, Kastis, Grinka, Vitkus, Cibirka, Bartkus, Buitkus, Kemezys, Vaseris, Ilginis, Macionis, Mauricas, Saparnis, Karvelis, and Marcinkevičius