Many people spell a horseshoer as “Ferrier”, this is incorrect in American English. The correct spelling is “Farrier”. So now that you know, we will assume when you use the word ferrier, that you are referring to a farrier with a nice hind end 😂😂😂. Or you are from 14th-17th century France and therefore a vampire.
And for your knowledge: It turns out that farrier (which is the current preferred English usage) evolved from the Middle French word “ferrier“, which meant blacksmith (back then, iron workers and blacksmiths were one and the same). Ferrier, in turn, evolved from the Latin word ferrarius which means “of iron”, which is from the Latin ferrum, “iron”. (Taken from here).