Rowan
late 15th century (originally Scots and northern English): of Scandinavian origin; compare with Norwegian rogn .
wiktionary
Scots and Northern English, of North Germanic origin (Old Norse reynir). Related to Norwegian Bokmål rogn, Danish røn. Ultimately related to the root of red.
rowan (plural rowans)
etymonline
rowan (n.)
"mountain ash," 1804, from rowan-tree, rountree (1540s), rawntre (late 15c.), northern English and Scottish, from a Scandinavian source (compare Old Norse reynir, Swedish Ronn "the rowan"), said in Watkins to be ultimately from PIE root *reudh- "red, ruddy," in reference to the berries.
There were those in this neighbourhood, long after the beginning of the present century, who believed that a slip of rowan tree carried on their person dispelled glamour, and rendered nugatory all the powers of sorcery and witchcraft. [Alexander Laing, "Lindores Abbey and the Burgh of Newburgh," Edinburgh, 1876]
