Last name Ontl (Ontl 
) , all around the world, is a rare surname. The surname Ontl is habitual in Croatia, where it is quite a rare surname, Czechia, where it is a rare surname, and Germany, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Croatia, Germany, and the United States. Very seldom, Ontl is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ontl | Spain, Czechia, United States, Germany, Croatia |
| august von ontl HR (b. 1860) |
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| friedrich ontl DE (b. 1908) |
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| todd a ontl American researcher |
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| lora ontl Croatian athletics competitor, HR (b. 1999) |
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