I have seen in certain books that there is gonna be a lot of buddha shunya kalpas after the bhadra kalpa. Also it has stated about names of 10 Buddhas after the Bhadra kalpa.
Is there a sutra source for these facts? Where can i find them?
There's no mention on the future buddhas except Metteyya buddha in the pali canon. However, there's a book, Dasabodhisattuppattikatha which was written much later than the compilation of the pali cannon, possibly influenced by Mahayana bodhisattva ideals. Here's a list of the 10 buddhas in that book.