All over the world, Leonille (Leonille 
) is a rare gender-neutral given name. The first name Leonille is characteristic of the Democratic Republic of the Congo, where it is a rare feminine name, and Philippines, where it is a very rare unisex name. Likewise, Leonille is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Leonille | Democratic Republic of the Congo, France, Rwanda, United States, Philippines |
| leonille elisabeth victoria barbara margarete prinzessin zu sayn-wittgenstein-berleburg (born 1941) (b. 1941) |
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| leonille gräfin douglas (born 1972) (b. 1972) |
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| leonille schweizer researcher |
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| leonille elisabeth judith maria anna prinzessin zu sayn-wittgenstein-sayn (born 1996) (b. 1996) |
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