What was buddas name?

Prince Gautama Siddartha of the Sakya clan is the usual answer, tho it is doubtful he was a prince in the sense we understand it. Remember, at the time and place where he lived, the land was divided up into small areas ruled by clans. There was no central government as we have now.

It is asserted that there have been other buddhas that preceded Buddha Sakyamuni and that there will others in the future. The next is reputed to be Maitreya.