The name Nicholson is a boy's name of English origin meaning "son of Nicol". Nicholson and is often added to lists like Best One-of-a-Kind Names for Boys and discussed in our forums with posts like "CAF with 6 children (a lot of unusual names) #9".
From the experts:
If you're looking for a Nicholas substitute or namesake, Nicholson would make a more distinctive path to the likable nickname Nick, fitting in with other newer patronymics like Anderson and Harrison. Unusual but not outlandish, it is associated with writer Nicholson Baker, library advocate and author of Vox. And as a surname, of course, with Jack.