I like the full names, but I of it were me, I would go with just the first name since it is shorter, catchier, easier to remember, and feels more universal. You can always mention the full name of the person who either designed it or was inspired from in the item description. For example: I would choose 'Frank' over 'Frank Sinatra,' 'Sly' over 'Sylvester Stallone' etc.
After 2 people telling me this I changed it. I actually have a reverse version of the white wallet I call Max and I think I'll name the reverse one Keiser 😂 pr maybe the other way around 🤔 https://image.nostr.build/d7a0ec2e9505801051bb515e525c1955b6d0ee7b0067bf062e0632fec59fff96.jpg