[name_f]Sophie[/name_f] is my personal favourite from your three finalists. For me it’s because I enjoy all the sounds of that make it up – the ‘s’ and ‘f’ fricatives are soft, smooth and flowing and the long vowel sounds give the name an open, gentle feel.
[name_f]Sophie[/name_f] doesn’t get nicknamed, except occasional shortening to [name_f]Soph[/name_f], but if you wanted a nickname around the home there are actually lots of playful options like, [name_f]Sosie[/name_f], [name_f]Sisi[/name_f], [name_f]Effie[/name_f], [name_f]Essie[/name_f], [name_f]Fifi[/name_f], [name_m]Fee[/name_m] and [name_f]Posy[/name_f].
[name_f]Sophie[/name_f] is classic, sweet, simple, friendly and easy-going. It’s a wonderful match for [name_m]Leo[/name_m]. [name_m]The[/name_m] way you are speaking about [name_f]Sophie[/name_f] sounds like a breakthrough in your search. I would choose it with confidence!