Etymology
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salesperson (n.)

by 1875; see sales + person. Generally intended to apply to persons of either sex, when it wasn't a blind swerve away from vulgar saleswoman or saleslady.

WANTED, an experienced LADY ASSISTANT, good salesperson, for a Bookseller's and Stationer's Shop, with Library. Permanent to a suitable person. Apply W. PORTER and SONS, Herald Office, Blackpool. [advertisement in The Bookseller, May 4, 1875] 

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Definitions of salesperson

salesperson (n.)
a person employed to represent a business and to sell its merchandise (as to customers in a store or to customers who are visited);
Synonyms: sales representative / sales rep
From wordnet.princeton.edu