Where does “Mailand” come from?

Mailand (German) comes from Latin Mediolanum, from Gaulish lānom — plain, field.

Ancestry of “Mailand”, step by step

Step	Language	Word	Meaning
1	Latin	Mediolanum	Milan
2	Gaulish	lānom	plain, field

Mailand — Etymology, Origin & Word History | Etymology Explorer