The last surviving poilu from World War I was Pierre Picault.
From the en.wikipedia.org
However, French authorities recognised Lazare Ponticelli as the last poilu, as he was the last veteran whose service met the strict official criteria.
From the en.wikipedia.org
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A French soldier (especially in World War I)
Purloo: thick stew made of rice and chicken and small game; southern U.S.
Poilu is a warmly informal term for a French World War I infantryman, meaning, literally, hairy one. The term came into popular usage in France during the era of Napoleon Bonaparte and his massive citizen armies, though the term grognard (grumbler) was also common. ...
A French infantryman during the First World War
French slang term for a soldier, the equivalent of "Digger" in the Australian Army. It means lit. hairy or hairy one. Probably an indication of the unshaven front line soldiers.