this is all I could find....
What does Avaya mean?
Avaya joins many other recent communications and technology companies with exotic-sounding, made-up names (such as Teligent, Agilent, and Verizon), thanks to what was probably a hefty payment to a name-consultant company. According to Avaya's website, "The name has a certain flair to it that says action, that says we're new, we're different." Whatever -- as long as it doesn't mean anything bad in Spanish.