Leonis \le(o)-nis\ as a boy's name is a variant of Leonard (Old German), and the meaning of Leonis is "lion strength".
The baby name Leonis sounds like Leoncio and Lyons. Other similar baby names are Leonid, Louis, Lewis, Teunis, Denis, Dennis, Deonys, Lennie, Leontios, Leonel, Leon, Lioni, Leone, Leonides and Leonidas.