Sloppy Joe, Hot Brown, and the Reuben are all well-known sandwiches, and they are all named after people. Though the specific person is argued in two of these cases. 
Research:

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“Bechamel Sauce.” ChefIn. https://chefin.com.au/dictionary/bechamel-sauce/#:~:text=History%20of%20b%C3%A9chamel%20sauce,(wife%20of%20Henry%20II).
Beck, Katherine. “The Controversial Origins Of The Sloppy Joe.” Tasting Table. Jan. 26, 2023. https://www.tastingtable.com/968736/the-controversial-origins-of-the-sloppy-joe/
Blitz, Matt. “The True Story of Ernest Hemingway’s Favorite Bar. Food & Wine. June 22, 2017. https://www.foodandwine.com/travel/bars/ernest-hemingway-favorite-bar-true-story
Fix, John. “Papa Wrote Here.” The Miami News. May 12, 1962. https://www.newspapers.com/image/302005791/?terms=sloppy%20joe&match=1
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“The Brown Hotel.” Historic Hotels of America. https://www.historichotels.org/us/hotels-resorts/the-brown-hotel/history.php#:~:text=In%20the%20early%201980s%2C%20the,obtained%20the%20building%20in%202006.
“J. Graham Brown.” The Courier-Journal. August 8, 1927. https://www.newspapers.com/image/107676260/?terms=%22james%20graham%20brown%22&match=1
Kral, George. “How the Gooey, Cheesy Hot Brown Became a Kentucky Icon.” Eater. Jan. 3, 2019. https://www.eater.com/2019/1/3/18165719/kentucky-hot-brown-history-recipe-brown-hotel-louisville
“LOUISVILLE’S CULINARY ICON, THE HOT BROWN.” The Brown Hotel. https://www.brownhotel.com/dining/hot-brown
Manoff, Arnold. “Reuben and His Restaurant: The Lore of a Sandwich.” Federal Writers Project. 1938. https://www.loc.gov/item/wpalh001447/
Martinelli, Katherine. “True to Its Design, the Origin of the Reuben Sandwich Is Messy, Too.” Eat This, Not That! January 16, 2019. https://www.eatthis.com/reuben-sandwich-origin/
Matte, Lisa Curran. “The Hotly Contested Origin Of The Reuben Sandwich.” Tasting Table. Nov. 13, 2022. https://www.tastingtable.com/1095929/the-hotly-contested-origin-of-the-reuben-sandwich
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Ngo, Hope. “What Is Béchamel Sauce And What Is It Used For?” Mashed. June 2, 2021. https://www.mashed.com/413609/what-is-bechamel-sauce-and-what-is-it-used-for/
“Pizza Sauce Brings Italian Food to Your Table.” The Sacramento Bee. Dec. 16, 1970. https://www.newspapers.com/image/619758051/?terms=sloppy%20joe&match=1
“Philanthropist J. Graham Brown Dies.” The Courier-Journal. March 31, 1969. https://www.newspapers.com/image/109504942/?terms=%22james%20graham%20brown%22&match=1
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Ramsey, Sarah “Where did the Sloppy Joe come from?” Wide Open Country. May 19, 2020. https://www.wideopencountry.com/sloppy-joe/
Scotti, Ippolita Douglas. “Was bechamelle really French, or an ancient Florentine sauce?” Flapper Press. March 6, 2019. https://www.flapperpress.com/post/was-bechamelle-really-french-or-an-ancient-florentine-sauce
Senyei, Kelly. “Inside the Home of the Hot Brown Sandwich.” Epicurious. April 4, 2013. https://www.epicurious.com/expert-advice/hot-brown-sandwich-tips
Singer, Phyllis. “Sloppy joes have chapter in food history.” The Courier. June 19, 1992. https://www.newspapers.com/image/359626043/?terms=sloppy%20joe&match=1
“Sloppy Joe’s Cocktails Manual.” 1932. Havana, Cuba. Accessed online: https://euvs-vintage-cocktail-books.cld.bz/1932-Sloppy-Joe-s/II
“Sloppy Joe History: The Origins of this Iconic Comfort Food.” Blue Apron. https:/