[name_m]Hi[/name_m] all,
[name_f]Catherine[/name_f] is a strong contender as an honor name after my mom (if we were to have a girl). She goes by [name_f]Cathy[/name_f], which I have no problems with, but I always imagine daughter to have a different nickname than her grandmother.
Not a huge fan of [name_f]Cat[/name_f]/[name_f]Kat[/name_f], or [name_f]Katie[/name_f]/[name_f]Kate[/name_f] either.
Any thoughts or opinions on [name_u]Kit[/name_u] or [name_u]Ren[/name_u]? Wondering if either of those two nicknames too much of a stretch?
Open to other suggestions! Thanks 
I like [name_u]Kit[/name_u] and [name_u]Ren[/name_u]! [name_f]Cate[/name_f] is sweet too.
Other ideas…
[name_f]Carrie[/name_f]
[name_f]Catherine[/name_f] [name_f]Lily[/name_f], [name_f]Catherine[/name_f] [name_f]Lucy[/name_f], etc nn [name_f]Callie[/name_f]
[name_f]Kitty[/name_f]
[name_u]Kay[/name_u]
[name_u]Kit[/name_u] is super cute! I like it a lot!
[name_u]Ren[/name_u] is sweet too!
Some alternatives could be
[name_f]Cece[/name_f]
[name_f]Erin[/name_f]
[name_f]Rina[/name_f]
[name_f]Cara[/name_f]
[name_f]Carrie[/name_f]
Caddy
[name_f]Cricket[/name_f]
[name_u]Kit[/name_u] is definitely not too much of a stretch - my sister [name_f]Kathryn[/name_f] was born when I was reading The Witch of Blackbird Pond for school, and I was determined to call her [name_u]Kit[/name_u] instead of [name_f]Kate[/name_f]! [name_m]Alas[/name_m], it didn’t stick, but it’s certainly a viable option for your [name_f]Catherine[/name_f]!
[name_f]Caitlin[/name_f] nn [name_u]Kit[/name_u]?
Edit: sorry i can’t read, you didn’t ask for name suggestions. I think Kit works, but Ren is a bit of a stretch.
[name_f]Cait[/name_f], [name_f]Erin[/name_f], [name_u]Wren[/name_u], Rini (ree-nee)
for [name_f]Katherine[/name_f]; [name_f]Kat[/name_f], [name_f]Katya[/name_f], [name_u]Kit[/name_u], [name_m]Kick[/name_m] (JFK’s sisters nn, her name was [name_f]Kathleen[/name_f] but it works for [name_f]Katherine[/name_f] too), [name_f]Erin[/name_f], [name_u]Wren[/name_u], Rini
I think [name_u]Kit[/name_u] and [name_u]Ren[/name_u] are doable.
I’d suggest nicknames for [name_f]Catherine[/name_f] from other languages, like [name_f]Katya[/name_f] (Russian), [name_f]Kasia[/name_f] (Polish), [name_u]Cato[/name_u] (Dutch) or Catou ([name_m]French[/name_m]).
I love [name_u]Kit[/name_u]! I would also suggest [name_f]Trina[/name_f], [name_f]Cassie[/name_f]/[name_u]Cass[/name_u], [name_u]Casey[/name_u], and [name_f]Rina[/name_f].
Our [name_f]Catherine[/name_f] goes mostly by [name_f]Cate[/name_f], but we call her by a variety of nicknames: [name_u]Cato[/name_u] (works well with her O middle initial), [name_f]Kitty/name_f, Rini, [name_f]Kasia[/name_f] (my mom’s family is Polish)… [name_u]Kit[/name_u] and [name_u]Ren[/name_u] are also cute!
[name_u]Kit[/name_u] is absolutely not a stretch, being a very traditional nickname for [name_f]Catherine[/name_f]. [name_u]Ren[/name_u] is a bit more offbeat but I think it would work. I also know a [name_f]Catherine[/name_f] who goes by [name_f]Erin[/name_f].
[name_f]Catherine[/name_f] nn [name_u]Kit[/name_u] is at the top of my list, and is an honor name for me, too.
[name_u]Kit[/name_u] and [name_u]Ren[/name_u] are both good [name_f]Catherine[/name_f] nns.
Probably already mentioned, but also [name_f]Kitty[/name_f], Trinny, [name_u]Cato[/name_u], [name_f]Trina[/name_f], [name_f]Katinka[/name_f], [name_f]Cathlin[/name_f], [name_f]Catlin[/name_f]. [name_u]Kit[/name_u] or [name_u]Ren[/name_u] are among my favourites though.
[name_u]Kit[/name_u] and [name_u]Ren[/name_u] are lovely and may not be intuitive but definitely have reason and I could definitely see them working. With that comes the cutesy [name_f]Kitty[/name_f] and [name_u]Rennie[/name_u]/[name_u]Renny[/name_u]. I heard Cather in a book once and thought that was lovely.
Other possibilities:
[name_f]Erin[/name_f]
[name_f]Rin[/name_f]
[name_f]Thea[/name_f]
[name_f]Carrie[/name_f]
Carrine
[name_f]Cece[/name_f] (for the “C” initial even if it goes against the sound)
[name_u]Kay[/name_u]/[name_u]Kaye[/name_u]