I guess, they derive from
Eliora and
Liora influenced by
Eliana and
Liana.
Eliara does not really appear in Brazil. I never met anyone with that name, though
Eliana and
Eliane are quite common there. The census of 2010 states 1744 people named Eliara - of over 200 Million inhabitants (Liara: 1662 persons).
I checked some portuguese websites, but I couldn't find any valid informations on either name.