UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/sjejɛs/US:USA pronunciation: respellingUSA pronunciation: respelling(sye yes)

WordReference Random House Unabridged Dictionary of American English © 2020
Sie•yès  (sye yes),USA pronunciation n.  Em•ma•nu•el Jo•seph  (sye yes),USA pronunciation ("Abbé Sieyès''), 1748–1836, French priest and revolutionist.
Collins Concise English Dictionary © HarperCollins Publishers::
Sieyès /French: sjejɛs/ n
  1. Emmanuel Joseph (ɛmanɥɛl ʒozɛf), called Abbé Sieyès. 1748–1836, French statesman, political theorist, and churchman, who became prominent during the Revolution following the publication of his pamphlet Qu'est-ce que le tiers état? (1789). He was instrumental in bringing Napoleon I to power (1799)

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