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Kit, Cat, Kate- Aside from the more popular Katherine/Catherine/etc. and Caitlin/Katelyn/etc., Kathleen/Cathleen, Katrina/Catrina/Catriona, Katerina/Katarina/Katharina/Catarina/Caterina, Kateri, Cateline, Katalin, and Caitria are some options.
Cass, Cassie, Cassia- Cassandra, Cassiopeia
Nikki, Nick, Nicky- Nicolette (I find it more interesting than Nicole.)