Joseph, the real shaylah is if the chosson’s name is Simcha and the kallah’s mother-in-law is named Simcha/
In such a case, is there a kedaida from Tzavas Rabi Yehuda HaChossid, that a chosson shouldn’t have same name as his father-in-law and kallah shouldn’t have same name as her mother-in-law?
Does it apply also across genders: kallah with the same name as father-in-law, chosson with the same name as mother-in-law?
It will be discussed in my soon to be published best selling sefer, מִבֶּ֧טֶן שְׁא֛וֹל (if my husband שאול approves the name because it is part of possuk ויענני מבטן שאול שועתי שמעת קולי).