Aesop, Fables 508 (from Chambry 125) (trans. Gibbs) (Greek fable C6th B.C.) :

"Zeus invited all the animals to his wedding. The tortoise alone was absent, and Zeus did not know why, so he asked the tortoise (khelone) her reason for not having come to the feast. The tortoise said, ???Be it ever so humble, there's no place like home.??? Zeus got angry at the tortoise and ordered her to carry her house with her wherever she went."

thus came the name khelone, because when i think of the tortoise with the house on its back as having a "heavy burden" and i linked it to emotional burden.