Leonie

Leonie sounds beautiful and elegant in German. In English, however, the pronunciation is obnoxiously ambiguous. English speakers would most likely naturally pronounce it "lee-OH-nee", but might be tempted to say "LEE-uh-nee". For English speakers, "LAY-o-nee" is a bit unnatural, and they'd resort to "LAY-nee".

In England Leonie is usually pronounced lee-O-nee and sometimes pronounced lay-O-nee or LAY-ə-nee.

We pronounce Leonie like Lee-knee. Not Lee-O-nee as a lot of people use, this is my sister in law's name, but hardly anyone pronounces it like this.

Aurelie is right (about Léonie). In Germany, the name is pronounced LAY-o-nee, not le-O-nee which would rather be the English variant. [noted -ed]

Pronounced as "Le-aw-nee".