This very possibly ancient tune is from Brittany, where it is named Dans En Dro after a type of dance that originated in the city of Vannes, located in the southern part of Lower Brittany.
Ref: https://thesession.org/tunes/2828
Ref: https://en.wikipedia.org/wiki/An_Dro
Ref: https://en.wikipedia.org/wiki/Breton_dance
: | Bm | G | A | F#m | |
Bm | G | A | F#mBm | : | |
: | Bm | G | A | F#m | |
Bm | G | A | F#mBm | : |