-arian

(Latin: a suffix forming adjectives from nouns ending in -ary; a person who, a thing that; a person who is a part of something, pertaining to one's state or condition; a person who has a connection with or belief in the stated subject; a promotor of something; a native or inhabitant of someplace; someone of a certain age)

latitudinarian
1. A person who is broad-minded and tolerant; especially, in standards of religious belief and conduct.
2. Someone who is unwilling to accept authority or dogma; especially, in religion.
3. Allowing some freedom in attitude, beliefs, behavior, or interpretation; especially, in religious matters.
libertarian
1. One who holds the doctrine of the freedom of the will, as opposed to that of necessity.
2. One who approves of or advocates liberty.
librarian
1. Someone who works in or is in charge of a library.
2. The keeper or custodian of a library.

Literally, "of books". Also, "a scribe or someone who is concerned with books".

lunarian
1. Inhabiting the moon.
2. Someone who observes or describes the moon; such as, anyone who used the lunar method in finding longitude.
3. Someone who observes or describes the moon.
malarian (adjective), more malarian, most malarian
Pertaining to or causing a serious parasitic disease which is caused by the bites of Anopheles mosquitoes: The period between a mosquito bite and the malarian symptoms is usually a week or two; however, it can be as long as a year if the person has been taking anti-malarian drugs which only suppresses rather than cures the disease.
mercenarian
1. Of or belonging to mercenary soldiers.
2. Someone who works or serves only for personal profit or who is motivated solely by a desire for money.
millenarian
1. In the etymological sense, relating or pertaining to a thousand.
2. One who holds or believes that Christ will reign on earth in person for a thousand years; a believer in the millennium.
nonagenarian, nonagenary
A reference to or designating the age from ninety to ninety-nine years old or one who is in his/her nineties.
nuditarian (s) (noun), nuditarians (pl)
Anyone who likes to appear without clothing; such as, at the beach, etc.
octogenarian
1. A person who is in her/his eighties.
2. A person who is eighty to eighty-nines years old.
ovarian
Pertaining to or of the nature of an ovary or ovaries.
parliamentarian
One versed and skillful in parliamentary usages and tactics; a skilled and experienced parliamentary debater.
pedarian
Applied to Roman senators of an inferior grade, who had no vote of their own, but could merely signify their assent to that of another; pedarii senatores.

In antiquity, those senators who signified their votes by their feet, not their tongues; that is, such as who walked over to the side of those whose opinion they approved of, in divisions of the house.

picarian
A reference to an extensive division of birds which includes the woodpeckers, toucans, trogons, hornbills, kingfishers, motmots, rollers, and goatsuckers.

Some writers also include the cuckoos, swifts, and humming birds.

piscitarian
A fish monger or one who sells fish.