Family name Sīlis (Sīlis 
) , all over the world, is a very rare cognomen. The last name Sīlis is habitual in Northern Europe, particularly Latvia, where it is quite a rare surname.
| jānis sīlis LV (b. 1886) |
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jānis sīlis Latvian linguist, LV (b. 1950) |
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| valters sīlis LV (b. 1985) |
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| atis sīlis LV (b. 1989) |
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