Margery Georgina Agrell was first married to Swedish businessman Harald Agrell, by whom she had two sons. She divorced him in the 1920s, after which she married Owen Mase. Not wishing to be known as Margery Mase, she thereafter used her second name Georgina. Several sources describe Mase as being a 'pseudonym for Ursula Greville', but this is not the case. The composer Ursula Greville did set some texts by Agrell/Mase and this is presumably the source of the confusion.