Hi,

Hercule

Hercule is French for/of Hercules.

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Hercules

https://en.wiktionary.org/wiki/Hercules

https://www.etymonline.com/word/Hercules#etymonline_v_9178

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Poirot

"Poirot's name was derived from two other fictional detectives of the time: Marie Belloc Lowndes' Hercule Popeau and Frank Howel Evans' Monsieur Poiret, a retired Belgian police officer living in London.
..."

https://en.wikipedia.org/wiki/Hercule_Poirot

Poirot is pronounced without -t. So it sounds like poireau (in French) which is leek.

https://en.wiktionary.org/wiki/poireau

https://en.wiktionary.org/wiki/leek

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Peter Ustinov about Poirot/poireau/leek

https://vimeo.com/432614547

01:02 minute

The best Peter Ustinov Hercule Poirot film (for me) is Evil under the Sun (1982). There is plenty of Mediterranean sun, great costumes/outfits, Cole Porter's music and of course Poirot's french accent (+ french phrases).

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In "my first foreign language", there is/was the expression "Big leek" which means Big Nothing/I don't care(="Big deal")/...
                                                               
It doesn't matter how smart Poirot is for the British he is an outsider, a foreigner, a French (pardon, a Belgian, but who cares) i.e. he is a Big Nothing. He is called Hercules Parrot or Mr. Porridge or ... ("There goes the most insufferable man in the world." Daphne Castle, Evil under the Sun)


porridge (n.)

https://www.etymonline.com/word/porridge#etymonline_v_18485

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Patrick Redfern: ... If Giuseppe Verdi had been an Englishman, his name would have been Joe Green.

Hercule Poirot: Yes, I suppose it would.

...

Hercule Poirot: Joe Green... It's rather more amusing than at first I thought.

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Hercule Poirot... It's rather more amusing than at first I thought.