I like
Charlie as a nickname.
Carlo is a stretch but its definitely more attractive than
Chuck or
Chucky. To put it politely, I really do not like them.
Chip is okay but sounds kind of... old fashioned? There are some weird ones like Chit and Chick, too. :)
https://youtube.com/@MarioDrama632 or
https://youtube.com/@Objects_2763 :3