How did Rickie or Rikki come to be a girl's name when it's short for Richard?

Two songs on the radio today have had me wondering that ("Chuck E's In Love" by Rickie Lee Jones and "Rikki Don't Lose That Number" by Steely Dan). What girl's name is it short for?

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BigAssLeech · 31-35, M

I don't know about Rickie, but I know that Rikki is an Old Norse name

HairbrushDiva · 31-35, F

@BigAssLeech I just checked that on Google and the "explanation" given there is even stranger than I thought. It says it's derived from Erica, a female version of Eric. I've never seen a connection between those names and Richard. The plot has thickened.