I think these names are timeless,
i imagine
Irene has brown hair, blue eyes, freckles, is about 5'3 and feminine (wears dresses, delicate)
Eileen has blonde hair, brown eyes, is about 5'6 and a bit tomboyish (climbs on trees, wears jeans-overall)
Aileen has auburn hair, green eyes, about 5'4 and acts boyish (helps on the farm, wears jeans and flanell-shirt)