Libido is the etymologically closer cognate known in English. The oft-quoted meaning 'sharp-tailed' is both etymologically and morphologically incorrect. Some abstract nouns developed etymologically by figurative extension from literal roots. These meanings represent at least three etymologically separate lexemes, but share the one form, fluke. "Wyvern" derives from Old Saxon "wivere", also meaning serpent, and is etymologically related to viper. In Modern English, the word "why" is one instance of an etymologically instrumental declension. Sometimes an entirely new or etymologically unrelated word is coined. In historical linguistics "suppletion" is sometimes limited to reference to etymologically unrelated stems. Brennan is etymologically unrelated to "Brendan". The etymologically related English term, "county" denoted the land owned by a count. The Etruscan name "Aril" is etymologically independent. Etymologically, the two words are unrelated. The word "menstruation" is etymologically related to "moon". It is not etymologically related to the word "male". Roman and Italian names are given, but they are not necessarily etymologically related.