Pringle's was first introduced in 1967. They went national in 1975.
There are several theories behind the origin of the name "Pringles". One theory refers to Mark Pringle, who filed a US Patent 2,286,644 titled "Method and Apparatus for Processing Potatoes" on 5 March 1937. Pringle's work was cited by Procter & Gamble (P&G) in filing their own patent for improving the taste of dehydrated processed potatoes. Another theory suggested two Procter advertising employees lived on Pringle Drive in Finneytown (north of Cincinnati, Ohio), and the name paired well with potato. Another theory says that P&G chose the Pringles name from a Cincinnati telephone book. (source)