Correct spelling for the English word "asselin" is [ɐsˈɛlɪn], [ɐsˈɛlɪn], [ɐ_s_ˈɛ_l_ɪ_n] (IPA phonetic alphabet).
There is limited information available regarding the etymology of the word "asselin". It seems to be a rare and uncommon term with multiple possible origins depending on the context or usage. Without more specific details, it is challenging to provide a precise etymology for this term.