Chris Erwitt is reference to Jesus Christ
From a reddit[1]
thread: Chris is short for Christian. Chris plus the last letter of his surname put together is "Christ." He was born on December 25, or Christmas. In Chapter 8's title art he's shown in the "crucifixion" pose. Chris is a doctor, so he's a healer like Jesus is said to be. In Chapter 9 Chris is worshiped by a tribe after he helps a sick member of that tribe. Chris has been called by others to be an angel or saint. He's surrounded by devoted male followers.