I can't believe your co-worker did that to you and I think that's so inconsiderate of her especially that she knew it was your first pick, but I agree with everyone else you can still use that name if you like it so much.

I have actually decided on another boys name which I love and won't be telling anyone as I don't want anyone to steal it if I have a boy, plus I have a friend (who is really wonderful) that is having a boy 6 weeks before me. I'd hope she wouldn't steal it but I don't know, so I've just decided to keep it a secret.