Yes, byname is a Scrabble word!
...and is worth 13 points in Scrabble, and 15 points in Words with Friends
byname
Noun
1. A familiar name for a person (often a shortened version of a person's given name)
What Scrabble words can I make with the letters in byname?
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1 Anagram of Byname
Words that can be created with an extra letter added to byname:
S:bynames