Comments for the name Augusta

Augusta is the capital of Maine.

It's the name of Neville Longbottom's grandmother in the Harry Potter series by Joanne Kathleen Rowling.

This is Lady Bracknell's first name in Oscar Wilde's "The Importance of being Earnest." It is one of my favourite plays!

Princess Augusta Sophia of Great Britain (1768-1840), daughter of King George III.

Princess Augusta of Saxe-Gotha-Altenburg (1719-1722) - wife of Frederick, Prince of Wales and mother of King George III of Great Britain.

Augusta of Saxe-Weimar-Eisenach (1811-1890), wife of the german emperor Wilhelm I.

Maria Augusta (1782-1863) was the only daughter of King Frederick Augustus I of Saxony and his wife Maria Amalie.

Augusta (1788-1851) was the daughter of King Maximilian I Joseph of Bavaria and his first wife Marie. She was married to Eugene de Beauharnais, the stepson of Napoleon.

Augusta (1580-1639) was the daughter of King Frederik II of Denmark and his wife Sophie.

Like it's said in one of the above comments, this name was already borne by King George III's mother, as well as his elder sister (who was, by the way, mother to later queen Caroline of Brunswick). But yeah, Augusta was probably only popularized by George III, since he was the King (as opposed to a 'mere' prince and princess of Wales).