This is by no means an exhaustive list, a lot of links are to Wikipedia articles, but it will hopefully serve as a quick reference list for people who want ideas, maybe for a throwaway reference in a single thread or similar.
Names:
Roman names - Forum Romanum; text of The Private Life of the Romans by Harold Whetstone Johnston Some Roman slave names Roman names - Carol Ashby; a wordpress site with research by a published author Roman personal names
Roman Names on Nova Roma