Conlanger

From Langmaker

conlanger n. [< CONLANG (a mailing list) + -er.] 1. A member of the CONLANG mailing list. 2. A person who constructs languages. Usage note: A person is not considered to be a conlanger if she studies constructed languages but doesn't create them (e.g., an Esperantist, a fan of Klingon).

Earliest Citation:

"Hey conlangers, enough with the colour terms already!" - Ronald Hale-Evans, CONLANG, "UNIFON", 4 October 1991