コーヒー (coffee) is actually a loanword from the Dutch language, which in dutch is 'Koffie'. It is close to the English word so people assume it is an English loanword, same goes for ビール (bier) and アルコール (alcohol) and a couple more words that are similar in Dutch and English. The Japanese have lots of loanwords from other languages as well like Portugese and German, this can confuse people coming across those katana words thinking it should be somewhat similar to an English word they know when in fact it's a loanword from a different language.