Who, where or what; Helenimou, Aghapimou, and Manoulamou; out of the Demis Roussos song, My Friend the Wind?

Answer 1

Heleni is a female name. Heleni mou means "my Heleni".
Agapi mou means "my love".
Manoula mou is an affectionate way to call one's loving female. Literally manoula means "little mama", but it's used in a romantic context, as well.

Answer 2

I was wondering as well looked it up, all these years listening to the song and now I know.