 The adjectival form "Rohirric" is common; Tolkien once also used "Rohanese".Like many languages of Men, it is akin to Adûnaic, the language of Númenóreans, and therefore to the Westron or Common Speech.The Rohirrim called their homeland the "Riddermark," a modernization by Tolkien of Old English "Riddena-mearc", meaning, according to the Index to "The Lord of the Rings", "the border country of the knights"; also "Éo-marc", the "Horse-mark", or simply the "Mark".