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- DeLaney says, "Named in tribute to Major Richard Butler, an Indian agent at Fort Pitt in 1776."
- Miller says, "Butler Street, for the famous Butler family. General Richard, Mrs. Butler and the whole fighting family were much in the public eye and public favor. General Butler was an Indian trader and Indian agent before becoming a soldier. A local historian gives a vivid picture of the kind of mother Mrs. Butler was. 'On the occasion of Mrs. Butler's bidding farewell to her son, who was a Captain of the Pittsburgh Blues, she stood facing the whole company and said, so that all the men might hear her: "My son, remember you are a Butler. Keep that name ever in honor. Farewell! God Bless you." This name is also commemorated in the Butler County and Butler Town, and the names of the General and three sons are inscribed on the Oliver Avenue tablet."
- Source:Miller-chronicles, pp. 10–11
Source:Frey, p. 135: "Among the very earliest Pittsburgh houses were those of two brothers, Richard and William Butler. Built in 1784, at the corner of Penn and Marbury Streets, they were of logs, two stories high with windows of many small panes. Butler Street was named in honor of this distinguished family."
