What is the meaning of -ian?

From, related to, or like.

One from, belonging to, relating to, or like.

Having a certain profession.

Alternative form of -ien (-ian)

Forms verbs from nouns and adjectives.

used to form the infinitive of class 1 weak verbs (as well as a few strong verbs also ending in -ian like biddian or liggian, and class 3 weak verbs)

Denotes a follower of something.

Forms verbnouns.

Source: wiktionary.org