Surname Janecek (Janeček 
, Janecek 
) , throughout the world, is quite a common cognomen. The surname Janecek is habitual in Czechia, where it is quite a common surname, Slovakia, and Austria, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in Czechia, the United States, and Slovakia.
| VARIANT | COUNTRY |
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| Janeček | Slovakia, Czechia, United States, Germany, Croatia |
| Janecek | Slovakia, Czechia, United States, Germany, Austria |
| johann janecek Austrian politician and trade unionist (1861-1932), AT (b. 1881) |
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| clarence janecek American football player (1911-1990), US (b. 1911) |
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dieter janecek German politician, DE (b. 1976) |
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| otto janecek CZ (b. 1919) |
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| rudolf janecek (b. 1929) |
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| gerald janecek American philologist, US (b. 1945) |
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| jan janecek (b. 1938) |
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| robert janecek Canadian tennis player (b. 1972) |
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| john t janecek researcher (ORCID 0000-0002-2941-3701) |
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| matej janecek researcher, ORCID id # 0000-0003-0740-641X |
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| peter janecek |
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