Offer your thoughts or opinion on the input financial query or topic using your financial background.

Is there a rule that a merchant must identify themself when making a charge
Obviously, the credit card's administators know who this charge was submitted by. Contact them, tell them that you don't recognize the charge, and ask them to tell you who it was from. If they can't or won't, tell them you suspect fraud and want it charged back, then wait to see who contacts you to complain that the payment was cancelled. Note that you should charge back  any charge you firmly believe is an error, if attempts to resolve it with the company aren't working. Also note that if you really ghink this is fraud, you should contact your bank and ask them to issue a new card number. Standard procedures exist. Use them when appropriate.