You can call them whatever you want to call them, they don't have to have vampire names, they were humans before so they would therefore have human names afterwards as well.
groom
Yes, a male vampire.
Fiancé is the male version. Fiancée is the female version.
You seduce a male vampire causing the woman to be pregnant with a vampire child or you could have a male sim marry a woman vampire and get her pregnant to cause the same results.
Simple- he can't.
A "Dingo" is the male version of a cougar woman!
The male version of Gabrielle is spelt Gabriel
Male vampires are fertile. The child of a male vampire is called a Dhampir. I have never heard of a female vampire giving birth.
bobs
The male version of the name Cecilia is Cecil.
The feminine form of vampire is vampiress. The feminine plural would be vampiresses.
no, but if she is immortal by mating with a male vampire she can have a baby