According to the old texts, it is not clear if his sister is Hertha or not. Most refer to her as the unnamed sister. A possible explanation is that they were the same figures; an ancient hermaphroditic deity of nature. If that is the case then it makes good sense that Hertha gave birth to Njordr’s children. However, Odin’s denial of Hertha points to a mythological change regarding the origin of Njordr. Nonetheless, the acceptance of Njordr, Freyja and Freyr among the Aesir could imply evolution in the Norse fable.