from The American Heritage® Dictionary of the English Language, 4th Edition
- suffix Believer in; advocate of: utilitarian.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- suffix A believer in something.
- suffix An advocate of something.
- suffix A native or inhabitant of somewhere.
Latin -ārius, -ary + -an1.(American Heritage® Dictionary of the English Language, Fourth Edition)
A back-formation from various words ending in "arian", some directly derived from Classical or Medieval Latin words ending in -arius by adding -an to the stem, other indirectly via Old French words ending in "arien(ne)" or "erien(ne)" or from English words ending in "ary" to which -an was suffixed. -ary + -an (Wiktionary)