Heather
Old English hadre, hedre (recorded in place names), of unknown origin. The word was chiefly Scots until the 16th century; the change in the first syllable in the 18th century was due to association with heath.
wiktionary
From Middle English hather, hathir, from Old English *hǣddre and hǣþ(“heather”), cognate with Scots hedder, hadder, heddir(“heather”), Saterland Frisian Heede(“heather”), West Frisian heide(“heather”), Dutch heide(“heather”), German Low German Heide, Heid(“heather”), German Heide(“heather”).
etymonline
heather (n.)
early 14c., hathir, from Old English *hæddre, Scottish or northern England dialect name for Calluna vulgaris, probably altered by heath, but real connection to that word is unlikely [Liberman, OED]. Perhaps originally Celtic. As a fem. proper name little used in U.S. before 1935, but a top-15 name for girls born there 1971-1989.
