[name]Ellery[/name]: Definitely works with [name]Jameson[/name]. [name]Emery[/name] would work, too…
[name]Ava[/name]: Horribly trendy (but pretty) number one baby name in the country. I’d avoid this one like the plague… (Also, it’s too feminine to be paired with [name]Jameson[/name].) ([name]Edit[/name]: [name]Ava[/name] is #5, not #1…) Oops!
[name]Kinsley[/name]: [name]Kinsley[/name] feels and sounds “made up,” and quite trendy…
[name]Cameron[/name]: This one is really overused these days…
[name]Ember[/name]: At first, I thought I was looking at a typo of [name]Amber[/name]. [name]Ember[/name] and [name]Jameson[/name] doesn’t work in my opinion, and the name makes me think of fire.
[name]Charlotte[/name]: The classic, feminine [name]Charlotte[/name] doesn’t work with the masculine [name]Jameson[/name], but I love the name!
[name]Harper[/name]: I think [name]Harper[/name] and [name]Jameson[/name] definitely works…
[name]Hayden[/name]: [name]Hayden[/name] is very trendy, and has the same feel of the mega trendy [name]Aiden[/name], [name]Jayden[/name], [name]Cayden[/name], [name]Brayden[/name].
[name]Ivy[/name]: I love the classic/vintage [name]Ivy[/name], but the style and femininity doesn’t work with [name]Jameson[/name].
[name]Ella[/name]: See [name]Ava[/name].
[name]Kate[/name]: See [name]Charlotte[/name].
[name]Ellie[/name]: I think [name]Ellie[/name] is a cute nickname for [name]Elizabeth[/name], [name]Eliza[/name], [name]Eleanor[/name], etc., but I think it’s not substantial enough on its own. (It’s also too feminine for [name]Jameson[/name]'s sister.) What about using it as a nickname for [name]Ellery[/name]?
[name]Avery[/name]: [name]Avery[/name] is very trendy, but it works with [name]Jameson[/name]…
[name]Raina[/name]: The exotic and feminine [name]Raina[/name] doesn’t work the the masculine [name]Jameson[/name].
[name]Macy[/name]: It has [name]Jameson[/name]'s feel, but if I were to see a [name]Macy[/name] and a [name]Jameson[/name], I’d assume [name]Macy[/name] was a girl, and [name]Jameson[/name] a boy.
[name]Madeline[/name]: See [name]Charlotte[/name].
[name]Eleanor[/name]: See [name]Charlotte[/name].
[name]Evelyn[/name]: See [name]Ivy[/name].
I think you really need to stick to fairly masculine, unisex names, lest [name]Jameson[/name] be mistaken for the boy. A classic name, like Vivan or one of your above names, could work in the middle. ([name]Just[/name] avoid already dated trendy names like [name]Taylor[/name] and [name]Madison[/name]…)
[name]Arden[/name]
[name]Auden[/name]
[name]Blakeley[/name]
[name]Camden[/name]
[name]Carlin[/name]
[name]Connolly[/name]
[name]Delaney[/name]
[name]Emery[/name]
[name]Ellis[/name]
[name]Flynn[/name]
[name]Grayson[/name]/[name]Greyson[/name]
[name]Hadley[/name]
[name]Kenley[/name] (an actual surname, although she was a kooky girl on Project Runway)
[name]Kerrigan[/name]
[name]Linden[/name]
[name]Lane[/name]
[name]Quinn[/name]
[name]Quincy[/name]
[name]Rowan[/name]
[name]Romilly[/name] (feminine place name, but for some reason, I think it could work with [name]Jameson[/name], especially if you call her [name]Romy[/name] with [name]Jamie[/name])
[name]Spencer[/name]
Good luck! 