An Etymological Dictionary of the German Language/holen
holen, vb., to fetch,’ from MidHG. holn (variant haln), vb., OHG. holôn (halôn), ‘to call, invite, lead or fetch (hither).’ Comp. OSax. halôn, OFris. halia, Du. halen, ‘to fetch’; AS. geholian and *gehalian, E. to hale. The Teut. root hal, hol, corresponds to Lat. calâre, ‘to convoke,’ Gr. καλεῖν. Comp. further Hall, hell, which probably belong also to the same root.