Definition of "Rilla"

His pet name for her was Rilla-my-Rilla - a little pun on her real name, Marilla. She had been named after Aunt Marilla of Green Gables, but Aunt Marilla had died before Rilla was old enough to know her very well, and Rilla detested the name as being horribly old-fashioned and prim.

1921, Lucy Maud Montgomery, Rilla of Ingleside, Echo Library, published 2006, page 12