What is it exactly that makes first names sound feminine or masculine?

Okay, but first you have to list some names.

My uncle Leslie named his daughter Leslie. Honest! Although it seems that my family always called my uncle “Less-lee” and my cousin “Lezz-lee.”

Is that why posters keep thinking** kunilou** is a woman?

My first name is Lauri, and I’m a man. My wife’s name is Robin. Somehow people seem to have trouble deciding who is who when we are introduced as Robin and Lauri…