No, it is not. The name Yamna was given by the archeologists which discovered the culture. They were Russians and named it in Russian: "yamnaya", which means "pitt-grave", after the burial sites that typified this culture and distinguished it from the otherwise similar neighboring "catacomb" (which is again a reference to the burial rites) culture . Now , the right question would be if the russian word yamnaya shares its etymology with the Vedic Yama - yes, it does.