Cognomen Gillar (Gillar 
) , around the world, is a rare surname. The family name Gillar is habitual in Czechia, where it is quite a rare surname, Slovakia, where it is a rare surname, and Austria. In absolute terms, it is the most numerous in Czechia, Germany, and the United States. Very seldom, Gillar is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gillar | Indonesia, Germany, United States, Tanzania, Czechia |
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richard gillar German choir director (1855-1939), CZ (b. 1855) |
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| valerian gillar CZ (b. 1839) |
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| jan gillar Czech architect, CZ (b. 1904) |
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| jaroslav gillar CZ (b. 1942) |
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| martin gillar Czech manager, CZ (b. 1978) |
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