Héarún

HÉARÚN—XII—Herun, Heyrun, Heyron, Heron, Hearon, Herron, Hearn, Hearne, Herne, etc.; Middle English 'herun,' i.e., the heron, one with long slender legs and neck like a heron. This surname in Ireland dates back to the early 13th century, but does nor appear to have been ever very common, and was confined to South Leinster.

Alphabetical Index to Irish Surnames