It's just that people can't spell Rachel. I once came across a youtuber named Rachel, who had a rant about how people in the comments can't spell Rachel despite it being in the channel name. Maybe it's just people who can't spell and maybe it's spellcheck, like those autocorrect mistakes, which are meme worthy. I have tried having a username elsewhere where autocorrect often changed one character to turn it from a rarely used word to a commonly used word. It really highlighted how many forum posts are written with autocorrect enabled. Fun times.