The English language has gone through quite the evolution over the centuries and etymology, or origin of words, can be truly fascinating.
One example is the word sneeze which used to be spelled fnese.
The verb was first written down sometime in the fifteenth century, but it's a lot of different forms since throughout history.
Around that same time, the words snese, sneese, scniese, and sneez were all recorded, among others.
Even earlier, in Middle English, it was spelled fnesen, and the story of how that first letter changed is quite interesting.
Back then, people sometimes used the long "s", an archaic way of spelling the letter that looked sort of like an "f" and since words beginning with "fn" were so infrequent in the English language, people just assumed that the spelling was incorrect and changed it to have a long "s" instead.
If you're curious about where fnesen originated, it comes from the Old English fneosan and Proto-Germanic fneu, ultimately deriving from the Proto-Indo-European reconstruction pneu, meaning "to breathe".
Wow, you really do learn something new every day!