on (one's) bill

On the list of items one is expected to pay for. Just pick out whatever you want and put it on my bill. Can you explain this strange charge on my bill?

Common Names:

Name	Pronounced	Usage
Cnut	KNOOT (English), KNYOOT (English)	History
Gay	[gei]
Alban	AHL-bahn (German), AL-bən (English)	German, French, Albanian, English (Rare)
Riordan	-	Irish
Tzufit	-	Hebrew
Yijun	-	Chinese