(First, again, I know many of them got names in books).
I'd say two of the big ones were Dukat and Damar. I think in some cases, they couldn't decide if some races had one name (i.e. Klingons) or more than one. It almost seems like they started to think that GUL was Dukat's first name. As his right-hand man turned revolutionary leader grew in importance Damar never got a given name either.
Leeta seems to be the one recurring Bajoran character who never got a full name either. I assume "Leeta" was her given name.
It would be years after their introduction that both Winn and Bariel would get given names. In fact, the one good thing about the episode "Resurrection" was learning it and having Kira actually refer to him by it, which makes much more sense. I admit they did come up with a clever way of establishing Winn's given name, having "Anjohl Tennan" call him that, cementing their relationship (even though she never called him by HIS given name, as I recall).
Guinan was the only one of three el-Aurian characters of note to never get a full name.
Mr. Kyle, the erstwhile original transporter chief never got a first name either.
Then, of course, there was Sulu, who didn't get one until ST6 and Uhura, who had to wait until Abrams took over, for Pete's sake!
I'd say two of the big ones were Dukat and Damar. I think in some cases, they couldn't decide if some races had one name (i.e. Klingons) or more than one. It almost seems like they started to think that GUL was Dukat's first name. As his right-hand man turned revolutionary leader grew in importance Damar never got a given name either.
Leeta seems to be the one recurring Bajoran character who never got a full name either. I assume "Leeta" was her given name.
It would be years after their introduction that both Winn and Bariel would get given names. In fact, the one good thing about the episode "Resurrection" was learning it and having Kira actually refer to him by it, which makes much more sense. I admit they did come up with a clever way of establishing Winn's given name, having "Anjohl Tennan" call him that, cementing their relationship (even though she never called him by HIS given name, as I recall).
Guinan was the only one of three el-Aurian characters of note to never get a full name.
Mr. Kyle, the erstwhile original transporter chief never got a first name either.
Then, of course, there was Sulu, who didn't get one until ST6 and Uhura, who had to wait until Abrams took over, for Pete's sake!