From Middle English þe, from Old English þē (“thee”, originally dative, but later also accusative, supplanting accusative þec), from Proto-Germanic *þiz (“thee”), from Proto-Indo-European *te (“second-person singular pronoun”). Cognate with Saterland Frisian die (“thee”), West Frisian dy (“thee”), German Low German di (“thee”), German dir (“thee”, dative pron.), Icelandic þér (“thee”). More at thou.