"There is an eagle sitting on the ash Yggdrasil who knows many things."
    He is, in the North, aar, in Germany ar, in Scotland erne; though we and the modern Germans use, in eagle and adler, mere contractions of the Latin aquila...
    With much doubt I question whether the name of Ernest should not be added to this catalogue.  It is obvious to take its native German form, Ernst, from ernst, earnest, grave, or serious, but this is quite unlike the usual analogy of such names.  Arnust was the older German form of the name (Ernst), and some even think that this was the proper name of Ariovistus, the German chief who fought with Caesar, though others consider this to be Caesar's version of Heerfurst, or general, and others think they detect the universal root ar, husbandry. (History of Christian Names, Yonge, 1884)