I am a descendant of George Ricker.My limited research has the surname also spelled Riccar and Ricart.
I'm fairly sure the forename is correctly spelled Maturin.
I expect that it was Riccar (or Ricart) when they came over from French language Channel Islands (Jersey) and they eventually changed it to the more Anglo/German Ricker spelling, but apparently not before 1706, according to the journal.
I have posted elsewhere that Ricart and Maturin are principally Spanish language names.Ricart derives from the Barcelona area.The name is most prominent today, in Spanish language areas, worldover.
The Channel Islands were a sanctuary for those fleeing Spanish and French Inquisitions.Jews and Protestants "got out of Dodge" and wound up in Holland, England and the Channel Islands.
Some speculation has Ricart as being originally Jewish, but websites for Sephardic Spanish surnames, do not turn up Ricart.
My guess is that the origin of the family was Spain or Southern France, and that they were Protestants--"Huguenots."
Any ideas, validation, contrary facts or speculation?