I would say that vie-EE-rah.
My reaction would be… eep!
[name_f]Vera[/name_f]. Really the only way to go. Vyra/[name_f]Vira[/name_f] would be more vie-rah (like virus. lovely). [name_f]Viera[/name_f] is, vee-air-ah. Vyera is a little scary. Sorry. Stick with [name_f]Vera[/name_f]. It is lovely and your mom will get over it.