Looks like another version of Saerbothach.

I have been working on landscape elements which get called Taggart - but they seem to be the cornfield of the freemen - an-t-Saor gart or something. How do we tell if there were genuinely people called the priesstson, and how many were living by the freemen's cornfield. Taggart was not a common name, not as common as all the close Taggarts and Thalloo Taggarts suggest.