Austu is the Sicilian, Corsican, Sardinian form of
August, so it might be from that? (
http://en.wikipedia.org/wiki/August_%28name%29) Austu means "dawns, becomes light" in Latvian... but I think it as a form of
August is more likely. It appears in some English/American census records as a form of
August (see:
http://en.wikipedia.org/wiki/Gus_Hetling reference 2)
My PNL = http://www.behindthename.com/pnl/37275
Top: Henry & Lara (main) / Caspian & Briar (GP) / James & Georgiana (top25)
Bottom: Randall & Memphis (main) / Dinadan & Melpomene (GP) / Owain & Itonia (top25)