Channa mereya is the title of a song from the film Ae Dil Hai Mushkil. The translation of the entire song can be found at the link http://www.bollymeaning.com/2016/09/channa-mereya-lyrics-translation-ae-dil.html.
Btw, we saw that Dharma's official Twitter account said Channa Mereya means 'light of my soul' which is a very nice poetic meaning. Of course channa, that is moon, is symbol of light, and mereya is mine, that could well be my soul. Hence the meaning.