Yeah, the word
knight comes from the Old English word
cniht (I think I'm spelling that right), which basically just meant "servant", and it eventually evolved into the word
knight as we know it today. It's similar to how the word
chivalry comes from a French word that meant nothing more than "horsemanship", but it has since taken on a much different meaning.
Fun side fact,
cniht also developed into the Germanic word
knecht, but they more or less retained the original meaning. So a
Landsknecht in the most literal sense is a "Land servant." Words are fun.