It's spelled Charlton in real life, but the signature says 'Charton'. ; (that was my first clue above, about anyone having a 'chart on' how many names there are).
And just to go through the other clues I dropped...
"By God" I think I know it... - Greatest Story Ever Told, Ten Commandments, Ben Hur - he did lots of Bible epics.
"It's people"... - Soylent Green...which you find out as the movie goes on what exactly Soylent Green is..."It's people!"
Hopefully not "dirty"... - Planet of the Apes - as in, get your hands off me, you 'dirty' ape.
"Uy guvalt"... - Both Moses and Ben Hur were Jewish characters.
All those hints, and no takers. ; Holy Moses, what a disaster! - There goes Moses name-dropping again. ; And the 'disaster' reference of course from the 1970s disaster movies of which he appeared in a few.