Cognomen Lonc (Lonc 
) , in the entire world, is a rare family name. The family name Lonc is characteristic of Eastern Europe, particularly Slovakia, where it is quite a rare surname, Poland, where it is a rare surname, and Czechia. In absolute terms, it is the most numerous in Poland, Slovakia, and the United States. More frequently, Lonc is the forename as well as the last name.
| william lonc (b. 1930) |
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| elżbieta lonc Polish parasitologist, PL (b. 1951) |
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| zbigniew lonc Polish mathematician, PL (b. 1958) |
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| radek lonc Czech athlete, CZ (b. 1977) |
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| kaitlin m lonc researcher (ORCID 0000-0003-0728-9823) |
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