I went to school with 4 brothers, in order of birth: Matthew, Mark, Luke, and Richard. I think the parents didn’t realize the naming trend until after the 3rd child.
A friends mother (now deceased) was born Ethel in the 1910s. When she was in her late teens she legally changed her name to Bertha – a very popular name at the time. Years and years later she remarried after the death of her first husband and became Bertha Sidebottom.
-L.
My maiden name is Sidebottom! My family was very careful when choosing names specifically for that reason 😀