How do i check in western union which i only knew the senders last and first name?

To check a Western Union transaction using only the sender's last and first name, you typically need the Money Transfer Control Number (MTCN) associated with the transaction. You can visit a Western Union location or their website and provide the sender's name to the customer service representative, who may be able to assist you further. However, for privacy and security reasons, they may require additional information to verify your identity.