What is the meaning of -ier?

spelling of the suffix sequence -y followed by -er, or of any word ending in -y suffixed with -er.

Used to make agent nouns, particularly with words from French: clothier, perfumier.

appended to a word, it yields a noun which signifies the subject who performs something related to that word

forms the names of trees or bushes bearing a particular type of fruit

forms the names of ships

forms the names of jobs

A noun-forming suffix, used especially to render similar suffixes in borrowings from French.

Alternative form of -er (suffix forming or denoting a verb)

Alternative form of -er (suffix forming or denoting an agent noun, often a profession)

suffix used to form infinitives of first conjugation verbs

indicates a profession

indicates location, where one lives

-an; making a noun, describing a person by nationality, e.g. Indienindier, Iran, iranier

Source: wiktionary.org