Call him something that he gives you, as you grow to know the horse, you will begin to feel he is imprinting with you. Follow that message. A six year old stallion Blue, is a playful spirit but can get jumpy when overly excited. It was suggested he be named "Jumpy" but, I stuck with the name Blue because he is a Blue Roam, and the name felt right. Books with baby names are a good place to look too.
A gelding
Castrated* llama is called a Gelding, same thing for a castrated horse.
Your gelding shouldn't act like a stallion, if he does, you might want to call a vet or research it.
a gelding
gelding
I would call the local veternarian.
male is called stud or gelding the female is either filly or mare
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A male horse that has had its testicles removed is called a gelding. A gelding can't breed, but is generally considered easier to work with and more likely to get along with other horses.