Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
LEGGAT
As described in historical dictionaries
Patronymica Britannica (1860)
LEGGAT. Lat. legatns, a legate, ambassador. At the date of the Domesday survey, Hervey Legatus was a tenant in capite in co. Bucks, and Richard Legatus had the same tenure in co. Gloucester.
Surname type: Status name
Origin: Celtic
Region of origin: British Isles
Country of origin: Scotland
Religion of origin: Christian
Language of origin: Gaelic