In my tree I have a Zephaniah Rice b. 1792 in Suffolk. In the records Zephaniah is spelt in various ways.
There are two people named Zephaniah Rice, both born 1792 both in Suffolk.
With such an unusual christian name it seems too much of a coincidence.
I can understand it with a name like Jack Jones but not Zephaniah.
I had this trouble with one branch of my family from Lincolnshire. They tended to be large families and they all gave their children the same 'family' names At one point I had 3 living Canutes!