See the results of this poll: Is Isadora as a first name too much when her brother’s middle name is Theodore?
Respondents: 40 (This poll is closed)
- Yes it’s too much. : 9 (23%)
- No it’s not really a problem.: 31 (78%)
If [name_m]Theodore[/name_m] was his first name, I’d say no. But since it’s his middle name, I see no reason to avoid [name_f]Isadora[/name_f] as a sister’s first name!
You call your son [name_m]Archie[/name_m], right? What would you plan to call a little [name_f]Isadora[/name_f]?
Thank you for your response here and also in the other thread!
This one seems like a case of me overthinking things.
I agree, it’s not too similar if [name_m]Theodore[/name_m] is your son’s middle name. actually I really like the idea of having their names sound kind of related in a subtle and unique way. i say go for it 
As one is a first and the other a middle, I think it’s just fine. In fact, I kind of like the link between the two in such a way.