Grandeur

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late 16th century (denoting tall stature): from French, from grand ‘great, grand’ (see grand).

wiktionary

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Borrowed from Middle French grandeur, from Old French grandur, from grant (French grand), from Latin grandis(“grown up, great”).

etymonline

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grandeur (n.)

c. 1500, "loftiness, height," from French grandeur, from Old French grandor "size, height, extent, magnitude; greatness" (12c.), from grand "great" (see grand (adj.)). "Being a word of late adoption, it retains the Fr. form -eur of the suffix." Extended sense of "majesty, stateliness" in English is first recorded 1660s.