I love your boys names! A bunch of your names are on my all-time favorite list.
Also, I secretly love Harry Potter names.
Andrew: I definitely like Andrew. It's a little common, but it's really nice anyways, especially when it's not shortened to Drew.
Asher Nathaniel: I don't love Asher. It's a little hard for me to say and seems a little nicknameish. If you have to do an Ash- name, I like
Ashton.
Benjamin Jay: I love Benjamin. It's such a handsome name, and Jay works well with everything, IMO!
Cedric Daniel: LOVE Cedric! I think it's so different...it's a strong name (and it reminds me of Robert Pattinson in his pre-Twilight days...which is good

)
David: Classic. A nice name, but overall too common I think.
Henry: I think Henry's a very nice name. It seems very dignified and...European to me. Haha I like it.
Hugo: On its own, I'm not that crazy about this name, but it makes me think of Josh Hartnet's character in "O", which makes me like it way more. Oh, associations!
Jackson Levi: Jackson's a little trendy for me. I prefer just Jack, but Jackson Levi makes for a nice pair.
James: LOVE. Such a classic, beautiful name. What's not to like?
Jasper: Also LOVE. Although it's extra-Twilighty these days, which I'm not crazy about.
Jude: LOVE LOVE! This is a little guilty-pleasure for me...but I would LOVE to meet a kid named Jude, I think it's such an amazing name.
Landon: LOVE LOVE LOVE LOVE LOVE! My all-time favorite name on planet earth. It's so handsome!!
Lucas Arthur: Lucas is another one of my faves, though I'm not extra-keen on Luke. It sounds nice paired with Arthur too.
Lucian: Not so crazy about it. It sounds a little bit like somebody with a bizarre accent saying "lotion" to me...I love
Luca though, for something similar!
Miles: Not my very favorite name...just not quite my style I guess.
Oliver Maxwell: I LOVE OLIVER. Such a cute, classy name. Maxwell's nice too, and I really like it as a middle name.
Tobias nn Toby: Toby is cute...but Tobias is a little weird for me. Just not my style.
William: I really like William! I think it's not used very much anymore, and I wish it was. It's so classic and nice, and I love the nn Will.
Zachary: A very nice name, but I know about seventeen million Zacharys...it's a little too common for me.
Allison nn Allie: I love Allison...I like it even better with just one l. It's really breezy and pretty, but Allie is a little trendy for me to use as an all the time nickname.
Cadence: I don't care for this name personally just because I have a hard time saying it! I know that sounds weird, but names that have that -den thing are awkward for me to pronounce. The den tends to turn into a diphthong--the d and the n sort of run together so that it's like Aidn. Haha that probably sounds crazy! But it's a cute name for those of you who don't struggle to speak english!
Claire Elizabeth: I think Claire's an adorable name! It's simple and gorgeous, and you can obviously never go wrong with Elizabeth.
Emma: I love this name, but it seems very common to me. I like
Emmaline as well, and it's a little more unique.
Evelyn: I LOVE this name!! It's so classy and seldom-used...it's gorgeous.
Isabelle Kate: Thank you SO MUCH for not using Isabella! It's so overused these days. I like the spelling Isobel, but it's a pretty name either way, and Kate is so pretty and simple.
Lily Hermione: I LOVE LILY!!! It is so pretty to say and to see written and it conjures such a lovely image, and Hermione's such a guilty pleasure...I LIKE it!!
Olivia Kerri : Kerri seems so dated to me, but since it's for your sister I guess it's all right.

Olivia's very pretty too, but just a tiny bit overused IMO.
Saoirse : I could never pronounce this name properly to save my life. It's very pretty and unique...but imagine having to deal with teachers stumbling over this name!!