Saturday In House Gists -Marrying Someone With The Same Name

Two people meet and introduce themselves and alas,they find out they share the same last name and are not related at all..Or that the last name of one is the first name of the other.................... The Relationship progresses and they decide to Marry and on the invitation card stands same last names of the two people about to marry.......I have seen about four invitation cards of people via IFTTT