brogue Look up brogue at Dictionary.com
type of Celtic accent, 1705, perhaps from the meaning "rough, stout shoe" worn by rural Irish and Scottish highlanders (1580s), via Gaelic or Irish, from O.Ir. broce "shoe," thus originally meaning something like "speech of those who call a shoe a brogue." Or perhaps it is from O.Ir. barrog "a hold" (on the tongue).
brogans Look up brogans at Dictionary.com
type of coarse shoes, 1846, from Ir. and Gael. brogan, dim. of brog "shoe" (cf. brogue).
leprechaun Look up leprechaun at Dictionary.com
c.1600, from Ir. lupracan, metathesis from O.Ir. luchorpan lit. "a very small body," from lu "little" + corpan, dim. of corp "body," from L. corpus "body" (see corporeal). Commonly spelled lubrican in 17c. English. Leithbragan is Irish folk etymology, from leith "half" + brog "brogue," because the spirit was "supposed to be always employed in making or mending a single shoe."