I’ve seen hyphenated last names; non-hyphenated; one partner take the others’ last name; and sometimes couples make up entirely new versions of their names. I love it when couples invent entirely new names, some of which were not remotely similar to either of the old names. That’s kind of fun – as they begin a new life together, they do so with a new name.
Old names: Caulfield and Stansberry
New last name: Stansfield (merging Caulfield and Stansberry)
Old names: Rush and Wood
New name: Rushwood