Selway of Somerset - part 3

In the previous post (Selway of Somerset - part 2) we noted that Mary Selway married Thomas Porch in Wisconsin, USA, although both had been born in Somerset, England.  Mary Elizabeth Maidment Selway was baptised on 16-Jan-1830 in the church of St Mary Magdalene, Chewton Mendip, daughter of James and Eliza (formerly Maidment).  Her husband Thomas Porch had been baptised 12 years earlier on 15-Feb-1818, less than 10 miles away in St Peter, North Wootton, son of John and Ann.

Did these two families know each other in Somerset before they emigrated and were linked through marriage in Wisconsin?

When Mary was baptised as a baby in 1830 she was given the name Mary after her father's mother.  Later when she married she took the name Porch and, whether or not she knew it at the time, this was her grandmother's maiden name.  Grandmother Miss Mary Porch became Mrs Selway and her granddaughter swapped names the other way, going from Miss Mary Selway to Mrs Porch.

Could Thomas Porch, baptised in North Wootton in 1818 be connected to his bride's grandmother Mary Porch, whose marriage placed her in the same parish in Somerset?

The St Peter North Wootton parish register entry for Mary's grandparents in 1781 lists:

• Bride: Mary Porch
• Groom: James Selway of Green Ore, Witham Friary
• Witnesses: Sarah Selway and Mary Read [Reed]

In the same parish 25 years later, the entry for the marriage of Thomas' parents in 1806 lists:

• Groom: John Porch
• Bride: Ann Clark
• Witnesses: Henry Clark Senior and Junior

With no mention of Porch relatives for either of these marriages there is little evidence to make a link other than the basic facts of same surname and same parish.