ASCAP says I WANT TO MARRY A LIGHTHOUSE KEEPER was written by Erica (note spelling) Eigen. It also credits her (with the same spelling) for 3 other songs. IMDb says Erika (note different spelling) Eigen wrote and performed it in “A Clockwork Orange.” It doesn’t list her for anything else. I’m going with “Erica.”

I just spent too much time researching this song and transcribing it for the thread Songs about lighthouses, only to find it had already been posted here. When will I ever learn?

The definitive (I suppose) recording can be found on the soundtrack album of “A Clockwork Orange” (1971) and can be heard on YouTube.