Mayne is NOT a synonym for man. It is southern dialect slang way to PRONOUNCE man. You won't see it spelled "mayne" by the people who talk that way... except maybe in written lyrics or dialogue (such as in fiction) or for emplasis. Other than that, why would anyone go to the trouble to write a word that's almost twice as long as the correct one and not as widely understood?
I could call you my main mayne and it might sound clever in a movie but makes no sense in print.
Fives is the plural form of five dollar bill. This bill pictures the first Republican president, the man who preserved the union and signed the emancipation proclamation freeing the slaves, Abraham Lincoln.
American currency includes ones, twos, fives, tens, twenties, fifties, hundreds, and some other higher denominations I can't even afford to look at, much less own.
In coinage, a five is the equivalent of 500 cents, 100 nickels, 50 dimes, 20 quarters, ten half dollars, or five dollar coins.
He gave me two fives for a ten.
Fives are printed at the Bureau of Engraving and Printing.