What do you call a wrist grab? Some call that katateDORI for instance.
Guessing you meant me, there...
Grabs are -dori, and throws are -nage. My (very limited) understanding, mostly from the book "In the Dojo" by Dave Lowry, is that uke is from the verb ukeru, meaning to receive (Uke is one who receives) and nage is from the verb nageru, to throw (Nage is the one throws).
A completely wild guess on my part is that there must be a verb like toriru (?) meaning to grab, and Tori would be the one who grabs. Just a slightly different word for the same idea as Nage.
Did I get close?