My favorites from your lists are:
[name]Amelia[/name], [name]William[/name], [name]Hazel[/name], and [name]Collin[/name]
[name]Amelia[/name], [name]William[/name], [name]Hazel[/name], and [name]Julia[/name]
[name]Amelia[/name], [name]William[/name], [name]Hazel[/name], and [name]Olive[/name]
[name]Amelia[/name], [name]William[/name], [name]Hazel[/name], and [name]George[/name]
[name]Amelia[/name], [name]William[/name], [name]Hazel[/name], and [name]Frederick[/name]
It seems like the first 3 all have and L and an -LI, -[name]EL[/name], or -IL sound so that might be a way to unify your choice. Some other possibilities with this theme:
[name]Amelia[/name], [name]William[/name], [name]Hazel[/name] and
[name]Eleanor[/name]
[name]Felice[/name]/[name]Felicity[/name]/[name]Felicia[/name]
[name]Marcella[/name]
[name]Matilda[/name]
[name]Natalie[/name]
[name]Sylvia[/name]
[name]Thalia[/name]
[name]Daniel[/name]
[name]Elias[/name]
[name]Elliot[/name]
[name]Gabriel[/name]
[name]Gilbert[/name]
[name]Giles[/name]
[name]Julian[/name]
[name]Oliver[/name]
[name]Nathaniel[/name]
[name]Philip[/name]
[name]Samuel[/name]
Other names:
[name]Beatrix[/name]
[name]Claire[/name]
[name]Claudia[/name]
[name]Edith[/name]
[name]Flora[/name]
[name]Florence[/name]
[name]Laura[/name]
[name]Louise[/name]/[name]Louisa[/name]
[name]Lucy[/name]
[name]Violet[/name]
[name]Vivian[/name]
[name]Abram[/name]
[name]Alexander[/name]
[name]Alfred[/name]
[name]Benjamin[/name]
[name]Calvin[/name]
[name]Charles[/name]
[name]David[/name]
[name]Isaac[/name]
[name]James[/name]
[name]Roland[/name]
[name]Seth[/name]