Baid is not a canonical or exclusive Jain surname. In Jain communities you commonly see surnames like Jain, Shah, Mehta, Soni, Birla, etc., but there are also Jain families with a variety of other surnames. The surname Baid is used by people of different backgrounds in India (not all are Jain), and some individuals with the Baid surname may be Jain, while others are Hindu or from other communities. If you have a specific family, their Jain identity would be better confirmed by family tradition or community records rather than the surname alone.