Popular Name Dilemma

So I am writing a story and I love the name [name_m]Caspian[/name_m]. However, the character that I would call [name_m]Caspian[/name_m] is a [name_m]King[/name_m], and I am afraid people would draw comparisons to [name_m]Prince[/name_m] [name_m]Caspian[/name_m] from The Chronicles of [name_f]Narnia[/name_f]. I got the name from a different book called Legends of The Ghost Dog, but the fact that both characters are royalty might be too much. (Like a detective named [name_m]Sherlock[/name_m] or a wizard named [name_m]Harry[/name_m].) Any help, ideas, or opinions would be lovely!

(FYI the other main characters are [name_u]Auden[/name_u] and [name_f]Elsie[/name_f])

Personally, I would definitely use a different one since Chronicles of [name_f]Narnia[/name_f] is so influential in pop-culture. Are you looking for new names for the character or just advise? If so, could you give in info about the setting so we could better suggest names?

I’ve never read the series, and didn’t make the connection myself. If you are looking for alternate names, would you consider the similar-sounding [name_m]Cassian[/name_m], [name_m]Cassius[/name_m], [name_m]Caspar[/name_m], [name_m]Casimir[/name_m], or [name_m]Castiel[/name_m]?

I was about to suggest [name_m]Cassian[/name_m] too and want to add [name_m]Crispin[/name_m] too the list!