The trends were obvious at school. So many Mark's, Craig's and Steven's; Debra's, Donna's and Susan's in my classes.
Some parents gave their children the names of church leaders, or presidents - George Washington and Benjamin Franklin; Bramwell; and possibly even godparents - Elizabeth Ginder.
What was so special about the first person to have a particular name, that inspired others to name their children with the same combination and for others to introduce mutations of the original over time. Minnie Mildred appears as a combination in one branch SIX times, sometimes with a surname added as an extra christian name to further point to the original bearer of the name. Plus there are two more who dropped Minnie but kept the surnames. Maybe there is another Minnie or Mildred further back who I haven't discovered yet, who was the inspiration.