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Cognomen Jirka (Jirka , Йирка) , around the world, is quite a rare family name. The family name Jirka is characteristic of Czechia, where it is quite a common surname, Austria, where it is quite a rare surname, and Slovakia, where it is a rare surname. In absolute terms, it is commonest in Czechia, Austria, and the United States. More frequently, Jirka is the forename as well as the last name.
Ka, Hájek, Vaněk, Říha, Matoušek, Moravec, Svoboda, Kolář, Kučera, Jelínek, Horák, Novotny, Zelenka, Černý, Macháček, Stejskal, Pokorný, Dvořák, Novotný, Čermák, Procházka, Veselý, Pospíšil, Němec, Kadlec, Ek, Petr, Marek, Sirka, Beran, Král, Janda, Toman, Trnka, Novák, Novak, Holub, Fiala, Zeman, Urban, Mašek, Soukup, Strnad, Adamec, Beneš, Havel, and Kratochvíl