2. As a way of explaining why there is no record of female leprechauns (and therefore no way to procreate in the traditional sense), some sources claim that leprechauns are the unwanted fairies that have been tossed aside by the rest of the community. As a result, leprechauns are described as grouchy, untrusting, and solitary creatures.


http://mentalfloss.com/article/62173/15-lucky-things-you-probably-didnt-know-about-leprechauns