Origin: English, Aramaic
Meaning: the English form of Bartholomaios, the Greek form of an Aramaic name, Bar-Talmai, meaning “son of Talmai”, the first part, Bar, meaning “son” in Aramaic. Talmai is a Hebrew name meaning “furrow”, referring to either a ploughman or someone who owned land.
However, I’ve also seen it listed as meaning “son of Ptolemy”, Ptolemy meaning “warlike, conflict, aggressive”.
Bart, Barty and Tolly are diminutive forms of the name.