I assume you are looking for something more complex than a song with a verse in one language and a chorus in another, since there are quite a number of English/Gaelic songs that cross that way. Like Shul a Roon (Irish)and Sad Am I Without Thee (Hebrides, I think).
Is a Macaronic song one that uses occasional words from another language? It would help if you could explain what it is you are looking for.
Thank you.
Blessings,
Barbara