I have a woman giving her children the same names during her second marriage, but of course the surnames were different.
I have a woman who named her eldest 2 sons after her father. First was illegitimate, born when she was 17/18 and was brought up by his grandma. Second was 10 years later, elder child of her marriage, so a different surname. I suspect that her husband's family accepted the fiction that her eldest son was her brother.
My GGM and her youngest sister were both named Elizabeth. GGM was known by her first and middle name. Younger sister had only 1 name. Another sister was Mary Ann but was known as Sarah. I've noticed other families on censuses who had 2 daughters with variations of Elizabeth.
A family with 10 daughters named one Mary and the youngest one Maria. Baby Maria died within a week of her baptism.