See the results of this poll: What should I name her?
Respondents: 37 (This poll is closed)
- Elizabeth (Libby): 19 (51%)
- Brenna: 5 (14%)
- Tierney: 2 (5%)
- Tiernan: 2 (5%)
- Molly: 9 (24%)
[name]Elizabeth[/name] ([name]Libby[/name]) - I voted for this name before reading that you already have a [name]Finnegan[/name] ([name]Finn[/name]), [name]Declan[/name] and [name]Sean[/name] (sorry but it was a knee jerk reaction). 
[name]Elizabeth[/name] now seems kind of formal next to their names but I do like [name]Libby[/name] or [name]Lizzie[/name].
[name]Brenna[/name] - trendy and unappealing
[name]Tierney[/name] - I like this name with your sons. I can picture a spunky, mischievous tomboy who lives life at full speed. This name may be the best “match” style wise for your family.
[name]Tiernan[/name] - A little too masculine for a girl in my opinion and shares the same ending with [name]Finnegan[/name] and [name]Declan[/name].
[name]Molly[/name] - Sweet and cute on a little girl but I can’t imagine a grown woman with this name.
Generally I wouldn’t pick [name]Elizabeth[/name] because I find it to be overused. However I have a friend you just named her daughter [name]Elizabeth[/name] and they call her [name]Libby[/name]. It’s so cute and not often thought of. I think [name]Elizabeth[/name] nn. [name]Libby[/name] sounds nice with your boys’ names.
[name]Elizabeth[/name] ([name]Libby[/name]) is perfect and sounds great with your other children!