@elmerot @linguistics That is definitely a possibility, but not a certain fact. That etymology would result in two different explanations for #FennoSwedish “mojn” and “morjens” respectively.
The Finnish greeting is discussed in Mikko #Bentlins doctoral thesis on Middle #LowGerman loanwords in #Finnish.
Equally intriguing, but not discussed anywhere, is the origin of Baltic #Finnic “hei”.