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where does the last name rankin come from
Rankin is a last name of Scottish and Irish origin.
Is the name, Rankin, a diminutive?
Rankin is derived from the medieval personal name Rankin, which is a diminutive of Ronald or Rand, combined with the diminutive suffix kin.

Question: What origins are there for that name?
Self-contained rewrite: What are the origins of the name Ronald?