I don't know about
Eirian, but
Lamya is pronounced:
lam-YA-ah'
the lam is short, almost like lem, and then ya is just like "yeah!", and then the ah' is a very short glottal stop.
OR you could pronounced it LAM-ya without the final glottal stop, which makes it sound much more beautiful.
however you choose to do it, just remember that in arabic the stress is always on the second to last syllable.