Cassidy is like
Kelly in that it can technically be a boy's name but it's an awkward fit. For both names the secret is to call the boy by a more masculine sounding nn, e.g.
Cass and Kell.
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“Violence, in truth, recoils upon the violent, and the schemer falls into the pit he has dug for another." -
Sherlock Holmes,
The Speckled Band
BTN's Resident Historian