I'm guessing (phonefagging now) dude is for
1)Jewish. Assumption, I know, but closer to an educated guess.
2)Start with last names using variances of "..berg..,…stein..,…gold..,…silver…thal ,etc.
I had no idea (Allison Mack) was until I looked into her last year. They almost slipped her by me. Watch out for the old last name switch-a-roo, pretty common in the (((tribe))). Ex. Lewin normally "Levin" or "Bronstein" magically became Trotsky.
Out, keep digging.