Boyfriend called me another girls name, my best friend?

Theyve never met before to my knowledge. He called me sarah when my name is tara... should I be worried? I was texting sarah one day and her name is sarah lee in my phone. He got upset because he thought it was a guy? How is sarah a guy name?

Fast forward to a couple of months he was laughing and said you're so funny sarah... my name is tara! This is the first time he's done that
Boyfriend called me another girls name, my best friend?
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