How do I check if my brand name is already taken before I fall in love with it?

Run it through the official IP India Public Search first, wordmark, phonetic and combined searches will catch identical and confusingly similar marks already filed or registered in your class. Also Google the name plus 'trademark' and check Instagram/domain availability, since a name can be legally free on the register but already own mindshare elsewhere, which causes its own headaches. Do this before you spend on a logo, packaging, or domain, a name change after money's spent is far more painful than one before.