Translation on sindarin

Hi! There is a quenya name Tindómiel which could mean “morning star”. So how we can translate this name into sindarin except Tinuviel?

Yes it is the same as Tinúviel in Sindarin.

Are there any options other than Tinuviel? For example, with the word minuial?

minuial "(dawn) twilight" does not have any other names combined with with. You could do Aurgil/Orgil or Aurel/Orel. Using aur & [ñ]gil or the archaic †êl.

Ok. Thank you!