The name is derived from Odin’s name Yggr (the deep thinker), and drasil (carrier) - it therefore means the Bearer or Manifestor of God.
Harper’s Book of Facts, 1905.
The god of eloquence and wisdom. He was the guardian of a well in which wit and wisdom lay hidden, and of which he drank every morning from the horn Gjallar. Odin once drank from this fountain, and by doing so became the wisest of gods and men; but he purchased the privilege and distinction at the cost of one eye, which Mimir exacted from him.
A Dictionary of the Noted Names in Fiction by William A. Wheeler, 1865.
An Illustrated Encyclopedia of Traditional Symbols by J.C. Cooper, 1978.