National

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late 16th century: from French, from Latin natio(n- ) ‘birth, race of people’ (see nation).

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From Middle French national, corresponding to nation +‎ -al.

etymonline

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national (adj.)

"of or pertaining to a nation or a country regarded as a whole; established and maintained by the nation; peculiar to the whole people of a country," 1590s, from French national (16c., from Old French nacion), and also from nation + -al (1). Opposed to local or provincial (or in the U.S., state).

Meaning "peculiar or common to the whole people of a country" is by 1620s. From 1802 as "established and maintained by the nation or its laws." As a noun, "citizen of a (particular) nation," from 1887. Related: Nationally.

National guard is from 1793, originally in reference to an armed force in France identified with the revolution; U.S. use is from 1847, originally a name sometimes given to the organized militia. National anthem is recorded by 1806.

A King though he's pestered with cares,

For the most part he's able to ban them;

But one comes in a shape he never can escape—

The implacable National Anthem!

[W.S. Gilbert, "His Excellency," 1894]