I know this question I'm about to ask was never dealt with onscreen (apart from the joke line about "Mr. Troi" in one of the films), so if anything, it's a novel-related question, therefore I'm asking it here:
Is it true that Betazoid society is matriarchal, and the males take the last names of their wives? For example, if this is true, Lwaxana would not have taken the name Troi from Ian - he took it from HER family (i.e. Ian had another last name before he married Lwaxana).
I seem to remember something about this from The Art of the Impossible, though I could be a bit fuzzy on this point....
On the other hand, the "Mr. Troi" joke aside, I don't remember Will Riker taking Deanna's last name after they got married. Maybe it's up to personal preference?
Is it true that Betazoid society is matriarchal, and the males take the last names of their wives? For example, if this is true, Lwaxana would not have taken the name Troi from Ian - he took it from HER family (i.e. Ian had another last name before he married Lwaxana).
I seem to remember something about this from The Art of the Impossible, though I could be a bit fuzzy on this point....
On the other hand, the "Mr. Troi" joke aside, I don't remember Will Riker taking Deanna's last name after they got married. Maybe it's up to personal preference?

For my part, I often assume that one of the leading Betazoid societies was, or ended up, matriarchal and this is retained in a semi-official capacity by segments of the nobility because it's tradition. Certainly Lwaxana seems to assume that her position as eldest female of the house grants her certain responsibilities and attendant privilige, but maybe that's just her
. 