Abiel: The son of Zeror and father of Ner, who was the grandfather of Saul (1 Sam. 14:51; 1 Chr. 8:33; 9:39). In 1 Sam. 9:1, he is called the "father," probably meaning the grandfather, of Kish.
http://www.christiananswers.net/dictionary/abiel.html
It appears that Dagon is also a work by H.P. Lovecraft. Don't know if its the name of an actual character of his or not.
Fallon: Jimmy Fallon - actor, Jennifer Fallon - author; also, a city in Nevada, something to do with London (an area perhaps).
Novak, Laric, Neftis - these have searches on google too. I'd suggest searching any names you want to use, if you want to know where and how they've been used before.
But I'll also add that it seems rather futile to keep changing names just because you find they're used somewhere else. If the name fits the character you're creating, then use it. Don't worry so much about whether or not its been used before.