English word -dom comes from Middle English -dom

Detailed word origin of -dom

Dictionary entry	Language	Definition
-dom	Middle English (enm)
-dom	English (eng)	Forming nouns denoting the condition or state of the suffixed word.. Forming nouns denoting the domain or jurisdiction of the suffixed word.. Forming nouns denoting the fandom of the suffixed word.. Forming nouns — usually nonce words — denoting the set of all examples of the suffixed word.

Words with the same origin as -dom