DD2 is 2.6 and called Keziah, and I call her either her full name or Kizzy about 50/50. Expecting DD3 in May and my favourite name so far for the baby is Keturah, which I would use Kitty as a nn but my concern that Kizzy and Kitty together would be too similar/twee. I would do the same again and call her by her full name a lot as well