Hello, I am trying to order personalized shirt for my husband using our last name, the top of the shirt would have the last name with Irish Pub underneath. I want to make sure I put the correct for the last name.

"Mosses" Irish pub?

"Moss" Irish Pub?

Thank you
You asked for the plural, but I don't understand why. You only have one husband, so why plural? Did you mean to ask for the possessive? Does he own the pub? In that case, it's:

Irish Pub

If the whole family, i.e., the Mosses, owns the pub, then it's:

The Mosses'
Irish Pub

In either case you'll need the apostrophe ( ' ).

Emotion: smile