View Message

They're both way better than the other names you've suggested so far. Cecilia doesn't scream Catholic the way, say, Bridget or Magdalene would. Now if her name was Mary Cecilia, that would sound somewhat obvious, but not just Cecilia.
Cee-Cee or Sissy is the only nn I can think of for Cecily. I guess Cessy, but then it's getting into ridiculous territory, like baby talk.
I think both names are ok, but only just ok. The heavy s sounds make them seem very hissing or lispy, and remind me of the old line about Sister Susie sitting on a thistle.

---

"It's one thing to be open-minded and quite another to be so open-minded your brains fall out."--Dear Abby
"Let other people push you around, and you deserve whatever bad things happen after that."--Lauren Bacall