This is a Greek personal name meaning 'best-counseling,' composed of aristos (best) and boulē (counsel). Paul mentions Aristobulus in his greetings to the Roman church, specifically greeting 'those who belong to the household of Aristobulus.' The phrasing suggests Aristobulus himself may not have been a believer, but members of his household (family or slaves) were Christians. Some scholars speculate he may have been connected to Herod's family, as Aristobulus was a common name among Herodian nobility.