Premier

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late 15th century: from Old French, ‘first’, from Latin primarius ‘principal’.

wiktionary

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Borrowed from Middle French premier(adjective), from Latin prīmārius. Doublet of primary.

etymonline

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premier (adj.)

mid-15c., "first in time, earliest in appearance;" late 15c. as "first in rank or importance," from French premier "first, chief," from Latin primarius "of the first rank; chief, principal; excellent," from primus "first" (see prime (adj.)).

premier (n.)

1711 in the political sense, "the first minister of a state," a shortening of premier minister (1680s); see premier (adj.). In U.S. usage, premier formerly was applied occasionally to the Secretary of State (late 19c.).