Peyton comes from an English surname meaning "Pega's settlement" — Pega being an Old English personal name. The same surname produces the masculine Peyton (more common before 2000) and the increasingly feminine usage now.
Peyton entered the U.S. top 1000 as a girls' name in 1992 and rose rapidly. The character Peyton Sawyer in One Tree Hill (2003-2012) helped solidify the girl usage. Today Peyton sits in the U.S. top 200.
Peyton reduces to one — the number of independent ground.