[Doug]

Originally Posted by snowyskiesau

As far as I know, it's pronounced 'crew sis'

There is a useful web site for astronomy pronunciations:

http://members.aol.com/nlpjp/procon.htm

I noted that the above web link uses the term 'genitive'

Many languages have a genitive case, including Arabic, Croatian, Czech, Finnish, Georgian, German, Greek, Icelandic, Irish, Latin, Lithuanian, Polish, Russian, Sanskrit, Serbian and Slovenian. English does not have a proper genitive case, but a possessive ending, -'s (see below), although pronouns do have a genitive case.

Given the fact that English does not strictly speaking use Genitive case, some of the genitive words are most likely non English in their given forms.
crew kiss is probably correct for a non anglisised pronunciation.
BTW Alpha is Arlfah and Beta is Baytah; and if you don't give an iota, that is Yotah