Yes, I did discover the Lithuanian dukes as well with the spelling Awgust. I also discovered the name of a woman Awgusta Carolina (first and middle) that was a land owner in 1913 in litvania (or some where near there). I do not know much about the Lithuanian alphabet or why the translation from the english "u" to "w". One of my best friends happens to be Lithuanian (speaks the language fluently), perhaps I should give her a call. As a matter of fact, she just named her new son Augustin (but no "w").
P.S. Ivayla is a beautiful name, and thank you for your response,