Burns seems to have been inspired by two songs on one broadside sheet in the National Library of Scotland: "Killychrankie" [sic] and "An Answer to Killychrankie." Neither bears any real resemblance to Burns's poem, but "Killychrankie" contains the words "Clinkim Clankim" (i.e., "wham bang") and observes that the Williamites thought the "Devil was there."

The "Answer" mentions that "Pitcur fell in a furr."

Other than these, no trace anywhere of a song that Burns could have "interfered with." The evidence shows that the song "Killiecrankie" was written by Robert Burns and extended by James Hogg.

I've searched the very comprehensive data banks of Early English Books and Eighteenth Century Collections without success for *any* use before Burns and Hogg of "brankie" or "bankie" in *any* sense. (Both collections include the available Scots works in the NLS, the British Library, the NY Public, etc.)

Burns himself may have coined the adjective "brankie" on the model of "brank." (A very similar line in a supposed "old song" mentioned by Hogg & Motherwell in 1834 has "vauntie" instead.)

At least one scholar has described the Scots dialect in Burns's poems as "synthetic" and even "fabricated." (Rather like Shakespeare's approach to English.) I don't know to what extent that judgment might apply to Hogg's language.