Good old Galion.  The word is from Latin through French, the one who is responsible for the bottle – the lord’s cup bearer.  The word is first attested around 1300 CE in a little list of members of a household.

• 09.022 Then Bilbo heard the king’s butler
• 09.025 not for the butler’s great flagons.
• 09.026 The butler went on talking
• 09.035 and the butler could be seen
• 09.037 and the butler
• 09.037 and help the butler
• 09.040 the butler?’ said one.
• 09.047 growled the butler.
• 10.040 and the butler.

“butler, n.” OED Online. Oxford University Press, June 2016. Web. 29 June 2016.