If there are two people at a meeting who are called Jones, you could say, "There were two Joneses at the meeting.
However, although the general rule is to add es to the name it becomes somewhat cumbersome with some names. For example, it looks most awkward if you said there were two Culbertsonses at the meeting, or two Edwardses, or two Bateses.
We are going to visit the Morrises. I like their cat. They named him Morris, just like the cat in those commercials. The Morrises' cat's name is Morris Morris.