1. Bavarian: This is the most common meaning and refers to someone from Bavaria, a region in southern Germany.
2. Bayere: This is the less common archaic form of "Bayer" which also means Bavarian.
3. Bayer (company): This refers to the multinational pharmaceutical company Bayer AG, headquartered in Leverkusen, Germany.
4. Bayer (surname): It is also a common surname, particularly in Germany and Austria.
The specific meaning of "Bayer" depends on the context in which it is used.