One of those not-so-endearing names was "Stormcrow". If you watch "The Two Towers", Saruman, (while posessing Theoden, the king of Gondor) calls him "Gandalf Stormcrow" when he comes to free Theoden from the spell of Saruman. He was called that by those that associated his arrival with bad times or bad news. In Middle Earth, he was highly regarded by some and despised by others and often mis-understood.
No so unlike Jeremiah, the prophet.
They said, "Come, let's make plans against Jeremiah; for the teaching of the law by the priest will not be lost, nor will counsel from the wise, nor the word from the prophets. So come, let's attack him with our tongues and pay no attention to anything he says." Jeremiah 18:18
Jeremiah was not liked in his time - even his "friends" didn't really like him. He life was in "jeopardy" many times, he spent time in jail and even in a cistern (a big pit that collects stormwater). Finally, when a man who really didn't like him either, Ebed-Melech, saved him he had to send 30 men to go get him (because he assumed that they would run into a bit of resistance).
So, maybe we can call him "Jeremiah Storecrow".