Originally, Vexar was a Revell plastic model of one of the Robotech combat robots. As a child, that was the nickname a dear friend of mine used, and we used it in stories we wrote together, and in other places.
Beyond that, in the child-of-Esperanto language known as Ido, vexar means to annoy. It may exist in Spanish or Italian as well, since vexare is Latin for the same meaning.
I have personally seen Vexar as a popular game nick, internet handle, and other small representations. To this end, I claim original status. In January or February 1992, I created the email address email@example.com, and have used Vexar ever since, wherever I establish an alias, such on irc #amiga hosted by amiganet.org . Hence, unless you are talking about plastic toys or plastic webbing, all other personal identity uses of Vexar are imposters, fakes, and wannabe's.
You may use this journal to verify Vexar identities. The artist and game developer in Phoenix is not me. I have no relation to any music businesses, either.