Nicky's really not that common a nickname for
Nicola. I know three girls called
Nicola or
Nichola (not including myself) and none of them ever get called
Nicky, except by their parents. I only know one girl called
Nicole, though my friend has a sister called
Nikole. I live in England and it's relatively popular where I live but I know several
Georgina's and as far as I know that's never really been popular.