First impressions + name

I’m writing a short story for my English class. But the response in writers corner seems to be less than here. So I need your help.
The story is set in 1900-1940 England (think Downton Abbey). My problem? I need names for the children!

I’ve got Lord Edward + Lady Catherine.
But I’m stuck at their 2 children. 2 Ladies

Which names sound most royal/noble/upperclass & please write your first impressions for the names.

Cecilia
Matilda
Charlotte
Rosalie
Helena
Violet
Victoria
Adelaide