Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
TAGGART
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
Tycwrdd, Welsh, a meeting-house. Tagair, Gaelic, to plead a cause, claim as a right, to reason, to debate.
Patronymica Britannica (1860)
TAGGART. The Gaelic Mac Taggart, sans \Iac.
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Surname type: From given name or forename
Origin: Celtic
Region of origin: British Isles
Country of origin: Ireland
Religion of origin: Christian
Language of origin: Gaelic