Well, it is pronounced "blow high" (or something pretty close). And to continue the fun facts, English used to have the word "haye" which is related to the Swedish word, but we stopped using it in favour of "shark". Since it sounds like a greeting (as does "high" for that matter) as well as a common feedstock for animals (hay), we'd probably use the alternative "hayefish", with or without the 'e', if we hadn't dropped it altogether.