The term Mormegil is only ever used in reference to Túrin's time in Nargothrond, where indeed he was commonly known by this name. However, we do have several recorded uses of the translated form 'Black Sword' during Túrin's later years in Brethil, and so it is possible that the Elvish name Mormegil continued in use during this time (that is, until Túrin's death in I 499).
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