If you're looking for an occupational last name for a merchant, I'd suggest Chapman. It's an Old English surname meaning someone who buys and sells. Wiki page.
Or you get creative with it. My character's family uses the last name Meridian (and has in his past several iterations in games), which I took from a geography term, because they have a history of being travelers. I'm not sure exactly what gil is made up (does the lore ever say?), but you could use a precious metal name like Silver or Sterling. Or if they work in a certain type of goods you could take something from that.
... last names are an interest of mine. Weird, I know.
Or you get creative with it. My character's family uses the last name Meridian (and has in his past several iterations in games), which I took from a geography term, because they have a history of being travelers. I'm not sure exactly what gil is made up (does the lore ever say?), but you could use a precious metal name like Silver or Sterling. Or if they work in a certain type of goods you could take something from that.
... last names are an interest of mine. Weird, I know.