Correct spelling for the English word "Haist" is [hˈe͡ɪɪst], [hˈeɪɪst], [h_ˈeɪ_ɪ_s_t] (IPA phonetic alphabet).
The word "haist" does not have a well-defined etymology. It appears to be a variant or dialectal form of the word "haste", which means to hurry or move quickly. However, without additional information about the context or specific usage of the word "haist", it is difficult to provide a more precise etymology.