1620s, from suburb + -an. Somewhat earlier were suburbian, suburbial (c. 1600). Latin had suburbanus "near the city" (of Rome), and in Church Latin suburbicarian was applied to the six diocese near Rome.
word-forming element indicating origin or derivation from, from French -ite and directly from Latin -ita, from Greek -ites (fem. -itis), word-forming element making adjectives and nouns meaning "connected with or belonging to." Especially used in classical times to form ethnic and local designations (for example in Septuagint translations of Hebrew names in -i) and for names of gems and minerals.
<a href="https://www.etymonline.com/word/suburbanite">Etymology of suburbanite by etymonline</a>
Harper, D. (n.d.). Etymology of suburbanite. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/suburbanite