I like Maureen - it makes me think of someone pale, dark-haired and beautiful. I think Eileen is pretty, and more unusual than Isla. Gertrude isn't great but Trudy is ok and Gertie is cute.
They're not fashionable, that's all.
Mavis is too closely linked to Corrie for me, but that goes for Ivy, Audrey, Elsie etc. I like Rita and Sally though.