Good luck with your surgery 
[name_m]Caleb[/name_m] [name_m]Finnian[/name_m] → I like this! [name_m]Handsome[/name_m] and bright with a cool stylish edge [name_f][/name_f]- and I think that edge balances out the softer sounds
[name_f][/name_f][name_m]Caleb[/name_m] [name_m]Finnick[/name_m] → it has a zippy sound, with a touch of flair and brightness. I don’t think it sounds overly made up [name_f][/name_f]- more like a surname turned given name?
[name_f][/name_f]That said, I do find this combo slightly choppy [name_f][/name_f] [name_f][/name_f]- as if I want a tiny bit more to it?
[name_m]Caleb[/name_m] [name_m]Fenwick[/name_m] → handsome with a hint of elegance, but a cheeky kind of charm to it. I don’t think it’s too surname-y or out there [name_f][/name_f]- especially for a middle name paired with a solid, classic, and familiar first name. If it helps at all, I know a real life [name_m]Fenwick[/name_m] 
I think [name_m]Caleb[/name_m] [name_m]Finnian[/name_m] is my favorite over all, followed by [name_m]Fenwick[/name_m], then [name_m]Finnick[/name_m], but I don’t think you can go wrong with any of them tbh