I think this may mean "sound", because the Farsi word for water is a:b, pronounced like the first two letters of obnoxious or obtrusive or some other "ob" word. Anyway, thought you'd like to know that.
I'm not sure where BtN got the meaning for this. Ava is neither sound nor water in Persian. 'ob' is water and 'seh-dah' is sound, according to my mom who speaks fluent Persian.
-- Anonymous User 7/27/2007
BtN is right on the origin of the name. It is Persian and means "voice, sound, or the call". The word 'Se-da' is the Arabic word for "sound" which, like many other Arabic words, has been borrowed into Persian. The actual Persian word for "sound" is, in fact, 'Ava'. And a more common Persian word for "voice" is 'neda' (also another Persian name).