Originally SCDDB assigned this tune as "traditional" but <<https://my.strathspey.org/dd/issue/3357/|issue 3357>> purports that it was by <<ddp:Elliott, George & Kennedy, Calum#12400>>. Although the entry for the tune on The Session website (<<https://thesession.org/tunes/18928>>) has some mild scepticism.

Anselm says he doesn't buy the Kennedy/Elliott hypothesis. <<https://doricfuture.co.uk/2020/09/21/bratach-bana-whats-in-a-name/|This article>> claims that the song was “made famous” by Calum Kennedy, not that he wrote it, and <<https://projects.handsupfortrad.scot/hall-of-fame/calum-kennedy/|this bio of Calum Kennedy>> names some of Kennedy's most well-known pieces but doesn't mention the song at all. The Gaelic lyrics don't sound like they were written in the 1950s, and the song is also very long and repetitive, which is what you want for a session of tartan waulking but probably not for popular entertainment. Finally, there are rumours of unrelated versions that predate the Kennedy/Elliott recording but these seem to be difficult to track down on the Internet. It seems vastly more likely that Kennedy and Elliott picked the song up somewhere and arranged it for recording, rather than coming up with it from scratch.

This tune turns up in various places with weird and creative spellings of its name.