Sibling names for Poppy?

I am writing a story for my English essay, and the main characters name is [name]Poppy[/name]. I’m not sure about last and middle names yet. She also has a twin brother, two older brothers, and two older sisters. I’m thinking of the name [name]Isabel[/name]/[name]Isobel[/name] for one of the sisters. Any help will be brilliant. Thank you xxx

[name]EDIT[/name]: Maybe the name [name]Isaac[/name] for the twin?