Etymology
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legionnaire (n.)

1818, from French légionnaire, from légion (see legion). Legionnaires' Disease, caused by Legionella pneumophilia, was named after the lethal outbreak of July 1976 at the American Legion convention in Philadelphia's Bellevue Stratford Hotel. Hence also Legionella as the name of the bacterium.

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Definitions of legionnaire
1
legionnaire (n.)
a soldier who is a member of a legion (especially the French Foreign Legion);
Synonyms: legionary
2
Legionnaire (n.)
a member of the American Legion;
From wordnet.princeton.edu