Congratulations! I love your children’s names, [name]Nate[/name] and [name]Tessa[/name]. Here are my thoughts on your list:
[name]Alaina[/name] (Uh-[name]LANE[/name]-uh): I like the [name]Elena[/name] spelling better, but don’t feel this is as classic as [name]Nate[/name] and [name]Tessa[/name].
[name]Amelia[/name] (Possible nickname (nn): [name]Mia[/name]): I like [name]Amelia[/name], but again, don’t think it’s the best complement to your other children’s names.
[name]Caitlyn[/name]: Again, not as classic. I prefer the [name]Caitlin[/name] spelling.
[name]Cecilia[/name] (NN: [name]Celia[/name]): This is adorable and I see it going well with your other children.
[name]Delia[/name]: Also cute, but prefer [name]Cecilia[/name].
[name]Elise[/name]: This feels a bit stiffer than [name]Tessa[/name], more serious.
[name]Evelyn[/name]: Very cute. Could see this working with [name]Evie[/name] as a nn.
[name]Kathleen[/name] (NN: [name]Katie[/name]): I love [name]Katie[/name], but prefer [name]Katherine[/name] or [name]Catherine[/name] to [name]Kathleen[/name].
[name]Laura[/name]: This is an interesting contrast to [name]Nate[/name] and [name]Tessa[/name], but somehow doesn’t feel right. What about [name]Clara[/name]?
[name]Lily[/name]: I prefer [name]Lucy[/name] to [name]Lily[/name]. What about [name]Millie[/name]?
[name]Lucy[/name] (I know, sounds “sing-song” but “I love [name]Lucy[/name]” and hate the other full names that go with it) !: This would make a cute sibset with [name]Nate[/name] and [name]Tessa[/name]. I like the -y ending, nice to have variety of endings with your names.
[name]Marissa[/name]: [name]How[/name] about [name]Clarissa[/name]?
[name]Natalie[/name]: I think [name]Natalie[/name] is too close to [name]Nathan[/name].
[name]Norah[/name]: This has a cute, vintage-y feel that matches [name]Tessa[/name], but do you want to have two N names–[name]Nathan[/name] and [name]Norah[/name]?
[name]Olivia[/name]: [name]Love[/name] [name]Olivia[/name], if the popularity doesn’t bother you.
This is a great list. I can see why you’re having a hard time narrowing it down. My favorites with [name]Nate[/name] and [name]Tessa[/name] are (in the following order) [name]Cecilia[/name], [name]Evelyn[/name], [name]Katie[/name] ([name]Katherine[/name]/[name]Catherine[/name]), and [name]Lucy[/name].