Not only her wolf but [name_u]Arya[/name_u] herself is known as Nymeria in the books. Nymeria represent her wanting more than what Westeros gives him, becoming a lady and being in background. [name_u]Arya[/name_u] wants to be a warrior [name_f]Princess[/name_f], a high septon, a knight and many more. She names her wolf Nymeria after the [name_f]Queen[/name_f] Nym - and later finds herself trying to find a happy place away from war. And Rhoynish mythos about [name_m]Long[/name_m] [name_m]Night[/name_m] revels who [name_m]Jon[/name_m]'s mother might be and thus gets more important. Rhoynish ruins are home to people with grey sickness.
Both Nym and Meria would be great nns since Ny seems to be a seperate word, one of Rhoynish cities is Ny Sar ( maybe the name originally was Ny Meria? There is [name_f]Queen[/name_f] Meria [name_m]Martell[/name_m] + after Mors’ death Nymeria had three other husbands. She seem to live long after her husband. )