Naming dilemma!

I have posted before about this but I thought I was settled with the names of my characters but know I’m over thinking things. Basically I am struggling to settle on the names for two of my characters in the family.

Last name - [name]Port[/name]
Dad - [name]Nathaniel[/name] ‘[name]Nate[/name]’ [name]Jacob[/name]
Mum - [name]Elena[/name] [name]Maeve[/name]
Older son - [name]Mason[/name] [name]Lyle[/name] - 11
Younger son - ??? (feisty, cheeky, hyper, energetic and loving) - 5
Daughter - ??? (will be a baby)

I had [name]Caleb[/name] and [name]Amelia[/name] but I don’t like the L’s in both the name and I don’t really like the M in [name]Amelia[/name] with the M in [name]Mason[/name]. I had [name]Riley[/name] for the younger son but I not so sure about it. So my question is do you think I should just go with [name]Mason[/name], [name]Caleb[/name] and [name]Amelia[/name] or [name]Mason[/name], [name]Riley[/name] and [name]Amelia[/name] or two different names all together. If you think I should rethink the name then please suggest name that you think I might like, would go with [name]Mason[/name], the last name and the parents name and that fit the character.

Thanks in advance.

[name]Just[/name] thought of the sib-set [name]Noah[/name], [name]Flynn[/name] and [name]Isabelle[/name] or [name]Flynn[/name], [name]Noah[/name] and [name]Isabelle[/name] instead. What do you think?

I would like [name]Flynn[/name], [name]Noah[/name] and [name]Isobel[/name] much better.

You’re overthinking it, definitely. [name]Flynn[/name] strikes me as a COMPLETELY different style from [name]Noah[/name] and [name]Isabelle[/name]. [name]Flynn[/name], [name]Riley[/name], and Miera or something. Geoffery, [name]Howard[/name], and [name]Isabelle[/name]. [name]Kieran[/name], [name]Noah[/name], and [name]Olivia[/name].

[name]Mason[/name], [name]Caleb[/name], and [name]Amelia[/name] are fine. Maybe replace [name]Amelia[/name] with something else; [name]Elissa[/name], [name]Charity[/name], [name]Sierra[/name]…

I think that [name]Mason[/name], [name]Riley[/name], and [name]Amelia[/name] is a good group.

I agree that [name]Flynn[/name] is completely different from [name]Isabelle[/name] and [name]Noah[/name]…

^This. All are sweet, classic, and of similar lengths. They all have nice, long vowel sounds, as do [name]Elena[/name] and [name]Nathaniel[/name].