Em

Also used in the Netherlands for both boys and girls, pronounced "Eh-m".
Short form for names starting with "Em".
My brother's name is Em, just as his full first name.
This name should be presented as unisex on Behind the Name in my opinion.

Also a diminutive of Emerald.

Good nickname, but I don't know why it isn't listed as unisex. I think it's also a good nickname for Emile and Emilio.