In my openion as loong as you guys are not within a "13 dine daju vhai" you should be fine. if you believe in science and human evolution ancestory is same.  surname, jat bhat etc all are created by the people later to keep the descipline and culture intact. when there was no rule of law, people used to follow those principles to keep the communal harmony. if you look the ancestory each and every person are brother and sisters even the surname is different.