How did stilts get their name?

Factual Questions
1

Well?

2

“stilt Look up stilt at Dictionary.com
c.1320, “a crutch,” from P.Gmc. *steltijon (cf. M.L.G., M.Du. stelte “stilt,” O.H.G. stelza “plow handle, crutch”), from PIE *stel- “to put, stand, place, cause to stand” (see stall (1)). Application to “wooden poles for walking across marshy ground, etc.” is from c.1440. Meaning “one of the posts on which a building is raised from the ground” is first attested 1697. Stilted in the fig. sense of “pompous, stuffy” is first recorded 1820.”

3

Because they have very long legs.

4

Thank you, Shagnasty! An answer, and a new reference tool. Excellent.