Carl Akeley, born in Clarendon, 8 mi away, is the closest. So far, no famous person on record was born in Barre. The best known of them is Lewis A. Swift, with articles in 39 languages. Across the town line, Albion lists 6, Leonard Mann first.
#1 best knownLewis A. SwiftScience & Medicine · 1820–1913+8more
From Wikidata and Wikipedia: people whose birthplace is Barre and whose English Wikipedia article agrees, ranked by how many Wikipedia languages cover each person. Nearby people are those born in a town within 35 miles; distances are town center to town center. People known mainly for crimes, and adult performers, aren’t listed. “The usual town” = everyone born in the towns gathered so far.
James T. Lewis: William F. Cogswell, Public domain, Wikimedia Commons
John Rankin Gamble: U.S. Government Printing Office, Public domain, Wikimedia Commons
Leonard Mann: Il_pistolero_dell_Ave_Maria_-_1969.png: Cavarrone at the Italian Wikipedia project. derivative work: Cavarrone, Public domain, Wikimedia Commons