To think that this is not pronounced

[NeedsAsockamnesty]

Castor, as in the boy's name.

My friend thinks it's pronounced like CasTOR

I think it's pronounced like CastER and that Caster,castor and Kaster are homophones.

I'm happy to be told I'm wrong and am being unreasonable but it's boggling my brain.

I'm having a baby in a couple of days had girls names sorted because that's what I was expecting turns out its a boy and Castor is on a very small short list

I can only keep thinking of the baddy in orphan black, sorry.

Youthecat yes, yes I am.

Expert would be pushing it a lot bit, but I know some stuff OP. Like how castor is pronounced and you are correct with Cass-tuh.