There is relatively little we know for certain regarding Bartholomew, other than his inclusion with the list of the twelve disciples. His name is the combination of two Hebrew words, “bar(son)” and “Talmai.” As it was common for sons to carry their father’s name, it's likely his father’s name was Talmai. “Bar” is part of other Biblical names. Examples include, Barabbas (son of the father), Barnabas (son of encouragement) and Bartimaeus (son of Timaeus).
There is some thought that Bartholomew is also Nathanael, who is mentioned in the Gospel of John. This is good reason to assume this. In the first three Gospels, what are called the synoptic Gospels, Bartholomew is listed closely with Philip. As you will read below, Philip finds Nathanael upon encountering Jesus. These common connections to Philip suggest Bartholomew and Nathanael are the same person. We will proceed under this assumption.