Where does “Alabaman” come from?

Alabaman (English) comes from English -n, from Old Norse -inn, from Proto-Norse -īna-, from Proto-Germanic -īnaz, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “Alabaman”, step by step

Step	Language	Word	Meaning
1	English	-n	Alternative form of -en; API; Alternative form of...
2	Old Norse	-inn	Used to create adjectives from nouns, meaning...
3	Proto-Norse	-īna-	—
4	Proto-Germanic	-īnaz	-en
5	Proto-Indo-European	-iHnos	Creates adjectives of materials
6	Proto-Indo-European	-no-	adjectival suffix

Every word from Proto-Indo-European -no- →