[Grammar] a Monsieur Savlon

[kadioguy]

(An example sentence in Oxford Modern English Grammar)

Lunch was served in the restaurant downstairs by the proprietor himself – a Monsieur Savlon whom we'd met briefly.

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Isn't Monsieur Savlon a proper noun? I am wondering why there is an "a" before it? Is the speaker implying there is at least one more Monsieur Savlon?

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(Source)

 

[dunchee]

https://www.ldoceonline.com/dictionary/a
→ 15 used before someone’s name when you do not know who they are

 

[Tarheel]

Two things. One, it was, apparently, the first time this person had been mentioned. Two, it's a manner of speaking--nothing more and nothing less. (My opinion.)

(Cross posted.)

Note that a person might also say one instead of a.