In the Avesta, airyaman (or airiiaman) is both an Avestan language common noun as well as the proper name of a Zoroastrian divinity.
The common noun is a theological and social term literally meaning "member of (the) community or tribe." In a secondary development, the common noun became the proper name of a divinity Airyaman, who is the yazata of health and healing.
In Zoroastrian tradition, Avestan Airyaman is Middle Persian Erman (Ērmān).
Read more about Airyaman: In Tradition, Scholastic Issues