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Thomas Hunt
Ben Castle's birth name is Benjamin Castle.
Gabe Castle's birth name is Gabriel Castle.
Cait Castle's birth name is Caitlin Castle Dellagloria.
Josh Castle's birth name is Joshua Walton Castle.
Warwick Castle
Larnach Castle
Elsinore Castle
It is an Old English name, and is a variation of Hold-Ward, a person who protects a castle and keeps it in order while the owner is away or otherwise distracted.
Windsor Castle...
Belvedere Castle.