Hi, fyi there have been several threads on this, so depending on your definition of brand, you'll find lots of suggestions
When were the first "brand" logos adopted and used? Did ancient civilizations use them at all to distinguish goods created by skilled craftsmen? - /u/XenophonTheAthenian starts us off in Sumer, while /u/gadarn points to Ulfberht swords. In this post, /u/texpeare shows a couple of Mesopotamian seals
Did the Romans have branded, labeled, and packaged goods? - /u/freevoulous shows various product seals from Rome
What is the earliest recorded evidence of a brand name on a product/tool? - /u/Tiako nominates Agathangelus of Antioch
Were there any popular and/or long-lasting brands/businesses in Ancient Rome? - /u/pinguis suggests garum from Aulus Umbricius Scaurus