Cognomen Zajíček (Zajicek 
, Zajíček 
) , in all the world, is quite a common last name. The last name Zajíček is characteristic of Czechia, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Austria. Not in comparison with a country's population, it is commonest in Czechia, the United States, and Slovakia. Much less frequently, Zajíček is the forename as well as the last name.
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| Zajicek | Czechia, Austria, Malaysia, United States, Slovakia |
| Zajíček | Germany, Slovakia, Czechia, United States |
| jan zajíček CZ (b. 1828) |
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| antonín zajíček Czech and Serbian physician, hospital director in Niš, CZ (b. 1845) |
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| edvard zajíček CZ (b. 1843) |
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| františek zajíček US (b. 1860) |
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| františek zajíček CZ (b. 1880) |
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| antonín zajíček CZ (b. 1883) |
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| františek zajíček political prisoner, CZ (b. 1896) |
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| gustav zajíček holocaust victim, b. 1897-09-09, CZ (b. 1897) |
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| karel zajíček CZ (b. 1888) |
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tom zajíček Czech member of Czech Parliament (1998–2010) and sociologist, CZ (b. 1948) |
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| jaroslav zajíček CZ (b. 1889) |
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jan zajíček ice hockey player (1951-), CZ (b. 1951) |
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pavel zajíček Czech poet and musician, CZ (b. 1951) |
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| vojtěch zajíček CZ (b. 1891) |
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| petr zajíček CZ (b. 1893) |
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Jan, Jarda, Jakub, Josef, Juraj, Jirka, Tonda, Honza, Filip, Ondra, Martin, Matěj, Mojmír, Miloš, Michal, Slavoj, Patrik, Daniel, Luděk, Luboš, Jiří, Vašek, Libor, David, Robin, Roman, Ing, Anna, Adam, Kuba, Petr, Ján, Emil, Ivan, Marek, Milan, Šimon, Míra, Aleš, Boris, Brian, Karel, Kamil, Pavel, Peter, Radim, Radek, Rosťa, Míla, and Staník