Augusta is a dignified name reminiscent of wealthy great-aunts, but with the fashion for both August and Gus for boys, Augusta could get some fresh energy.
Augusta was the title of honor given to the wives and daughters of Roman emperors, which then morphed into a given name, brought to England by the German princess who became the mother of George III.
Augusta is also a saint's name and a place name. Her literary Great-Aunt image was formed via the characters Lady Augusta Bracknell in Oscar Wilde's The Importance of Being Earnest, an elderly relative in the Harry Potter books, and Aunts Augusta in both Graham Greene's Travels with My Aunt and P.G Wodehouse's Jeeves and Wooster novels.
Augusta has a choice of two friendlier nicknames--Aggie and Gussie.