I love the name spelled
Katherine.
Catherine is acceptable, though I prefer the K spelling. Both
Katharine and
Catharine get on my nerves. That A in there just really bothers me. Every time I would see
Katharine Hepburn's name in print, I'd feel like erasing it and respelling it
Katherine. I'm not very good at coming up with middle names, but I know I would want a one-syllable middle name with
Katherine.