On my father's side, children were usually named after an older relative, but--when Granny went into labor, the German lady who delivered the twin boys suggested Heini & Fritz. Granny used those names for their middle names & Grandad's name for both their first names. I was named after the wife of Grandad's brother for my "American" name, & also was given an "Indian" name. (we are Choctaw, Cherokee, Chickasaw & whatnot from across the pond)
   On my Mother's side (Irish, Scot, Welsh, Cherokee), going back the 200 or so years we know about, the children were typically named after ancestors. Granny & Grandad named their kids after ancestors & siblings. They had 10 children who lived beyond childhood. The 1st, a girl, was named Maurice after a male relative. When the last one came along, Granny had not named anyone for her brother, Louis, so my Aunt Evelyn was given that 1st name. When she went to the post office to get her social security card, she told the postmistress it was a typo & became legally Evelyn Louise. I have a cousin Louise named after her middle name. Years later, my aunt told only me. My cousin--he son of that same aunt--had twin girls named Anna & Kathleen.
    My generation used some names of ancestors/relatives, &
added new names. When my older brother's youngest boy came along, he named the child for our deceased younger brother, Stephen. Coincidentally, my older brother's wife has a brother, Stephen.
As did our younger brother, my nephew has changed the spelling of his name to "Steven."