An Etymological Dictionary of the German Language/dannen

by Friedrich Kluge

dannen, adv., only preserved in the phrase von dannen, ‘thence, from thence’; MidHG. dannen, OHG. dannana, dannân, and danân, ‘inde, illinc’; AS. þanon, E. thence. For Goth. *þanana the word þaþrô, formed from the same root, was used.