Actually it seems to be a fairly common name for a town. There's one in Illinois, Ohio, Alabama, Iowa and Indiana ... all probably named after the Marengo Plain in Italy, site of the famous Napoleonic battle of June 14, 1800.
There's also a Cuban dance of that name (that's Cuba the country, not Cuba, IL or Cuba, OH) probably made popular in the little town of Marengo just southeast of Havana.
More useless information. :-)
"The cure for anything is salt water... sweat, tears, or the sea" -- Isak Dinesen
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