Old English 
Alternative forms 
From Proto-Germanic *galdran (“magical song, incantation”), from Proto-Indo-European *ghAl- (“to shout, sing, charm, enchant”). Cognate with Old High German galdar, kalter (“spell, enchantment”), Old Norse galdr (Icelandic galdur, “enchantment, spell”). Related to Old English galan (“to sing, shout”). More at yell.