"small pony," 1640s, "Shetland pony," from Shelty, abbreviation of Sheltand, metathesis of Shetland. Or the word may represent the Orkney pronunciation of Old Norse Hjalti "Shetlander."
shellac
shellfish
shelta
shelter
sheltered
Sheltie
shelve
Shema
she-male
shemozzle
Shenandoah