Thanks. Is there a reason to not use a suffix on Belegel and Beleglas? Would an accurate concept of Beleglasion be ' a male child who is a great joy' or is it more accurately 'the son of someone who's a great joy'? I've always been a bit confused on the exact nuance of -iel and -ion. I like the sound of Belegeldir and Beleglasion. But, of course I'm struggling to pick out the syllables so I can figure out where the stress goes.
Belegel and Beleglas are already made of two elements so a further suffix would make it unwieldy (and isn't really attested). Beleglasion would mean the second one 'a son of Beleglas, someone who is a great joy'; like Elrenniel 'daughter of Elrond' or Thranduilion 'son of Thranduil'.
Stress on all the names: Beleg = BEL-eg Belegon = BEL-eg-on Belegnir = BEL-eg-nir Belaith = bel-AI-th Belaithon = bel-AITH-on Belaithnir = bel-AITH-nir Beleglas = BEL-eg-las Belegel = BEL-eg-el