Yes it says that it's an old word for the moon. Llun these days will only be understood as "Picture", with "Lleuad" being the word for the moon.
Aha, I understand, thank you ... a word so old that it is no longer in use. I had misunderstood ... I'd thought it to be like, for example, "Hast", "dost", "thou", "thy", "thine", etc. in English ... that are old but still understood and occasionally used.
Since ga i is a future tense according to the notes, could this equally mean "will I get to see the picture"?
In the colloquial language is it usually used as a question in the present with the meaning - "May I...?".