Last name Plenca (Plenca 
) , throughout the world, is a very rare family name. The surname Plenca is habitual in Croatia, where it is a rare surname, Australia, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Plenca | Croatia, Australia, United States |
| julijan plenca chess player (b. 1989) |
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| jadranko plenca chess player (b. 1999) |
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