surname, early 13c., probably an agent noun from walk (v.) in the sense "to full cloth." preserves the cloth-fulling sense (walker with this meaning is attested from c. 1300). "Walker" or "Hookey Walker" was a common slang retort of incredulity in early and mid-19c. London, for which "Various problematic explanations have been offered" [Century Dictionary].

"Is it?" said Scrooge. "Go and buy it."
"Walk-ER!" exclaimed the boy.
"No, no," said Scrooge. "I am in earnest" (etc.)
[Dickens, "A Christmas Carol"]

updated on September 29, 2018

Definitions of Walker from WordNet
walker (n.)
a person who travels by foot;
Synonyms: pedestrian / footer
walker (n.)
a shoe designed for comfortable walking;
walker (n.)
a light enclosing framework (trade name Zimmer) with rubber castors or wheels and handles; helps invalids or the handicapped or the aged to walk;
Synonyms: Zimmer / Zimmer frame
walker (n.)
an enclosing framework on casters or wheels; helps babies learn to walk;
Synonyms: baby-walker / go-cart
Walker (n.)
New Zealand runner who in 1975 became the first person to run a mile in less that 3 minutes and 50 seconds (born in 1952);
Synonyms: John Walker
Walker (n.)
United States writer (born in 1944);
Synonyms: Alice Walker / Alice Malsenior Walker
Etymologies are not definitions. From, not affiliated with etymonline.