Cognomen Gelžinis (Gelžinis 
) , in all the world, is a very rare surname. The cognomen Gelžinis is habitual in Northern Europe, particularly Lithuania, where it is quite a rare surname.
| jonas gelžinis Lithuanian Righteous Among the Nations, LT (b. 1883) |
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| martynas gelžinis LT (b. 1907) |
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| jonas gelžinis Lithuanian racing driver, LT (b. 1988) |
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| ignas gelžinis Lithuanian racing driver (born 1991) (b. 1991) |
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