Family name Kazlauskas (Kazlauskas 
) , all over the world, is quite a common cognomen. The cognomen Kazlauskas is characteristic of Northern Europe, particularly Lithuania, where it is a common surname, Estonia, where it is quite a rare surname, and Latvia. In absolute terms, it most frequently occurs in Lithuania, the United States, and the United Kingdom.
| VARIANT | COUNTRY |
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| Kazlauskas | United Kingdom, Argentina, United States, Bangladesh, Lithuania |
| pranas kazlauskas (b. 1830) |
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| kazimieras kazlauskas (b. 1865) |
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| juozas kazlauskas Lithuanian Righteous Among the Nations, LT (b. 1896) |
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| vladas kazlauskas Lithuanian Esperantist, LT (b. 1897) |
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| jonas kazlauskas Lithuanian police officer, LT (b. 1903) |
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| vladas kazlauskas LT (b. 1898) |
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| juozas kazlauskas LT (b. 1909) |
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| benediktas kazlauskas (b. 1909) |
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| julius kazlauskas LT (b. 1913) |
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| jurgis kazlauskas LT (b. 1914) |
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| jonas kazlauskas (b. 1916) |
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| vytautas kazlauskas (b. 1919) |
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| jonas kazlauskas Lithuanian linguist, LT (b. 1930) |
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| ričardas kazlauskas LT (b. 1927) |
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| vladas kazlauskas LT (b. 1928) |
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