Many words carry a story with them. Why an old word here, and a new word there? If you can't figure it out, maybe you know someone you could ask, or you could look around.

Don't believe every word-history story you read on the internet; there's some nonsense, but you can learn how to double-check, and after playing with etymology a while, you'll get better at spotting fiction.
SandraDodd.com/etymology
photo by Holly Dodd, in India