There are no records surving that tell us about Cecilia's childhood.
There is no patron saint of history or historians.
I can find no referrence to any saint who would be the patron saint of either history or historians.
Saint Jerome
There is no particular saint.
Christophoros, also known as Saint Christopher, is a legendary figure in Christian mythology. He is said to have carried the Christ child across a river, and as a result, he is often depicted as a giant man carrying a child on his shoulder. Saint Christopher is considered the patron saint of travelers and is venerated by many Christians for his protection during journeys.
Saint George was an only child.
There are patron saints of children or orphans or social workers but no patron saint of child custody.
There are patron saints of artists but no designated patron saint of art history.
Which Saint Augustine? There are several.
Saint Philomena (who was a child herself, only 14 when she passed away), and Saint Nicholas (also known as Santa Claus) are patron saints of children.
It was never required to be named after a saint, but many parents chose to name their child after a siant. That saint became their child's patron, and is thought to look after the child in a special way. It is the same with confirmation names as well.
The history of Saint Simons Island is not too dissimilar from the history of the rest of Georgia. It was a place where agriculture bloomed and rice and cotton was grown there.