Marshall

[PeterCW]

The play was published in 1931. At that time it was normal in the UK and Ireland to refer to a man of a lower social class by his surname only.

 

[Rover_KE]

Rollercoaster, you could have saved us a lot of time if you had noticed that the Merriam-Webster definitions of Marshall all pertained to names.

The options you listed in the OP were all for the word marshal.