Meadow is too much of a word for me to think of it as a name. Maybe in ten years' time if it catches on more, I'll feel differently but for now, I can't take it seriously as a first name.
Willow has grown on me a lot recently. I like the imagery of willow trees as well.
I would say
Meadow and
Willow are too similar as sisters, for my liking. They're both nature names and both have the same sound at the end but not as matchy as
Brandy and
Mandy. Fine on someone else's children.
Jolly good names, perfick, every one of them. - The Darling Buds Of
May.