Hello,
I just recently noticed the similarity to Sylvanas's (Queen of Forsaken) name, and a Roman deity's name. Silvanus, who was supposed to be the god of the forests, wilderness, etc. Considering that Sylvanas was a ranger/hunter and the name resemblance Blizzard might have gotten the name from this deity.
Silvanus (mythology) - Wikipedia, the free encyclopedia
Sylvanas Windrunner - WoWWiki - Your guide to the World of Warcraft