small world-building concept/idea for wind waker:
hylians/humans in the Great Seas don’t have surnames. on places as small as islands, where everyone knows everyone, there really is no need for it. if you need to introduce yourself, you do so with your first name, followed by the island you hail from (ex: Link of Outset Island.) people having the same name on the same island is rare (mainly because it would get rather confusing.) but if it’s a name passed down in the same family line, it would be (given name) Jr./Sr. otherwise, if two people have the same given name and they are not related, it’s likely they’ll be given a nickname based on a physical characteristic.
if you are a merchant or pirate who lives primarily on the sea, you’d most likely introduce yourself with the name of your ship (this is more common with pirates, merchants are more likely to still give an island they hail from.) Some pirates may even introduce themselves as being “of the Great Seas.”
I imagine these naming conventions continue into New Hyrule Era, but some surnames do make a rare appearance, particularly if you have an important occupation.