Surname Kleja (Kleja 
) , across the world, is a rare last name. The cognomen Kleja is habitual in Slovakia, where it is quite a rare surname, Sweden, where it is a rare surname, and Argentina, where it is a very rare surname. In absolute terms, it is the most numerous in Slovakia, the United States, and Argentina. Very seldom, Kleja is the forename as well as the last name.
| marian michał kleja PL (b. 1874) |
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| dan berggren kleja Swedish researcher, SE |
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| monica kleja Swedish journalist, SE |
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