I have already added my research papers on researchgate, somehow the name of someone else was added as a co-author with a resemblence with the name of the actual person's name.
See "A researcher has wrongly claimed co-authorship of my publication" in https://explore.researchgate.net/display/support/Authorship for instructions how to correct this. But unlike this help page suggests, most probably it was not the other author himself who wrongly claimed co-authorship, but ResearchGate's automatic algorithm wrongly identified another researcher as co-author and assigned your publication also to his profile. This is a frequent problem in ResearchGate.