I like
Nicol and
Nichol for a boy, but would only use it as a mn nowadays. Other medieval pet forms of
Nicholas I like for boys are Nicolet, Nicolin, Colinet, and Collet (though I would spell this Colet).
Also, please be kind to punctuation. They don't like to be crowded together like that. :-(
Miranda

Proud adopter of 15 punctuation marks; see my profile for their names.