Years ago I read that the name Ricker, came from Richere, descendant of a mighty army.It came from a book that gave the definitions of surnames. Unfortunately, I can't remember the name of the book. I always assumed that the name was French as I am a descendant of George Ricker from the Isle of Jersey. Now I find that Ricker could be French, Spanish or German.
The Poland Springs water people (founded by Hiram Ricker in 1845) have a very nice website with an extensive Ricker genealogy that I haven't been able to access yet.They say that the Rickers of the Isle of Jersey were originally from Saxony.