I have a few “double” names in several branches, mostly occurring mid- to late-1800s, some of them are:
John and John (first died young)
Charlotte and Charlotte (both lived), mother Charlotte
Sarah and Sarah (first died young and possible a third Sarah, also died young), mother named Sarah
The following didn’t give two children in the family the same name, but…
My most confusing branch, all living at the same time, same town, same surname:
Three generations of James.
2nd generation, three sons (James, William and F. E. William) married, the sister remained single
3rd generation, three (cousins) named James, two (cousins) named William, two (cousins) named Emily
James was handed down since at least c1741
Now I understand why the third generation James strictly used his middle name! When I started researching the family I had no idea that his first name was James.
I don’t think it is in my tree, I believe I was helping someone else, when I found three sons with the same first name, all three survived childhood.
Perhaps this was mentioned already by another poster, but (years ago I read that) due to high mortality among infants and children it wasn’t too unusual to use the same name more than once, in order to increase the odds of the name being carried down.