Cognomen Janečková (Janečková 
, Янечкова 
) , in the entire world, is quite a rare family name. The surname Janečková is characteristic of Eastern Europe, particularly Czechia, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Ukraine, where it is a very rare surname. In absolute terms, it is the most numerous in Czechia, Slovakia, and Germany. Very seldom, Janečková is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Janečková | Czechia, United States, Germany, Slovakia |
| Янечкова | Ukraine |
| eliška janečková (b. 1883) |
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| růžena janečková CZ (b. 1889) |
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| růžena janečková CZ (b. 1892) |
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| anna janečková holocaust victim, b. 1904-11-13, CZ (b. 1904) |
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| blažena janečková Czech chess player (b. 1911) |
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| karla janečková Czechoslovak opera singer, CZ (b. 1921) |
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ester janečková Czech actress, CZ (b. 1972) |
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nora janečková Czech presenter (*1973), CZ (b. 1973) |
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| jiřina janečková holocaust victim, b. 1933-12-30, CZ (b. 1933) |
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ivana janečková Czech ski runner and Olympian, CZ (b. 1984) |
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| vlasta janečková Czech director and scriptwriter (1934-2012), CZ (b. 1934) |
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| emílie janečková holocaust victim, b. 1936-01-06, CZ (b. 1936) |
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| anežka janečková holocaust victim, b. 1937-08-10, CZ (b. 1937) |
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| albína janečková holocaust victim, b. 1942-12-16, CZ (b. 1942) |
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| žofie janečková holocaust victim, b. 1942-04-29, CZ (b. 1942) |
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Eva, Bára, Katka, Katja, Kája, Pavla, Petra, Peťa, Radka, Diana, Lenka, Linda, Lucia, Lucie, Lucka, Lydie, Jarka, Julie, Jitka, Terka, Naďa, Nicol, Aneta, Annie, Alice, Alena, Iva, Ida, Miri, Anna, Paja, Dana, Luci, Jana, Jens, Niki, Nikol, Nika, Hana, Vera, Olga, Ála, Ája, Marie, Marta, Majka, Mirka, Sára, Nina, and Ester