I want to say that I saw it alluded to in one quest out in Coerthas... there was a "my lord" and "my lady" exchange, and in the context I took it to be the same as "my lord husband" and "my lady wife"... another NPC talks about her 'beloved'. To be honest, though, I would assume that the region the NPC is in (or 'grew up in'...) would more often dictate to the husband/wife trends than race or clan.
There is the elezen lady in coerthas that speaks of her betrothed, who was thrown into the witchdrop. There's also the elezen who asks you to retrieve his dead wife's wedding ring for him. I also spotted some elezen npcs in the same zone (Dragonhead, male and female), the female knight says to the other "We cannot keep doing this. Think of your wife." as it's heavily suggested that they're up to something... Naughty. Tsk tsk.
I'm sure there are several examples outside of Coerthas of married elezen, I just can't quote them off the top of my head.