S/O loves Katie, and I like it myself, but there are a few longer forms I really like that shorten to Katie, and quite a few of our other names are longer with nicknames (Stephanie - Steffie, Christina/Kristen - Chrissy, Jennifer - Jenny, Robert - Bobby, Martin - Marty, Danielle - Dani). I’m not quite sure if I prefer Katie as a nn or a standalone anymore
Aghhhh! I love all of them! [name_f]Katherine[/name_f] & [name_f]Katrina[/name_f] are both so beautiful but [name_f]Katie[/name_f] is also so sweet on her own! (I also love [name_f]Katrina[/name_f] because it reminds me of [name_f]Katrina[/name_f] and the Waves - Walking on [name_f]Sunshine[/name_f] )
I like both [name_f]Katherine[/name_f] and just [name_f]Katie[/name_f] on its own. I think it really depends what direction you want to go in, but if lots of your names are longer with sweet, retro nicknames, then [name_f]Katherine[/name_f] “Katie” gets my personal vote. But I do like [name_f]Katrina[/name_f] too and think it’s a great fit for your list!
I love [name_f]Katie[/name_f] on her own but I think [name_f]Katherine[/name_f] nn [name_f]Katie[/name_f] also gives her options and fits with your other names
I think [name_f]Katie[/name_f] works great as a standalone, but if most of your potential sibling names are longer names with nns, I think [name_f]Katherine[/name_f] or [name_f]Katrina[/name_f] “Katie” would be best for your list. I lean towards [name_f]Katherine[/name_f] over [name_f]Katrina[/name_f], but I can see either for you!
I think [name_f]Katrina[/name_f] nn [name_f]Katie[/name_f] matches your style great! How do you feel about [name_f]Kathleen[/name_f]? It’s one of my favorite long forms of [name_f]Katie[/name_f]