What do you think of these names for our twins?

My husband and I are expecting twins, one boy and one girl. We think we've decided on what we would like to name them, which are:

Anna Astrid Ellinor

Otto Alexander Björn

We already have a daughter named Margrethe. I am terrible with overthinking, so although I like the names, I don't know if there's something I'm missing, or if they're not as good as we think they are, and we're just biased. So opinions are appreciated.