Ezra Hawthorne Blair // Ezra Hawthorne ? - I love Ezra, and Hawthorne has grown on me though it's always had a surname-y feel to me. I'm not a huge fan of Blair, though it goes okay. I like the suggestion of Grey/Gray as the second middle name. Ezra Hawthorne Chase would be very handsome, as would Ezra Hawthorne Jude. If you're still not sure I would look through other one-syllable names, because it flows nicely with just one syllable there.
Harper Nehemiah Ford // Harper Nehemiah ? - I actually do really like Harper on a boy, but Nehemiah isn't my style, and neither is Ford, because I automatically think of the car brand. Again, you'll probably want a one-syllable name at the end. What about Harper Nehemiah Bryce, Harper Nehemiah Luke, Harper Nehemiah Lane, Harper Nehemiah Finn, Harper Nehemiah Scott, Harper Nehemiah Hayes, Harper Nehemiah Tate, or Harper Nehemiah Blaine?
Percy Archer Thomas - I love all three names, but something feels clunky about how this combo flows. I don't think the teasing potential is a reason to not use a name you love, especially since kids will find a way to tease anyone if they want to. I think the only reason it feels off to me is because all names are two-syllable... maybe try a three-syllable name in the middle instead? Percy Christopher Thomas, Percy Abraham Thomas, Percy Benjamin Thomas, Percy Elijah Thomas, or maybe even just Percy Thomas Archer? It seems to flow a tad better for some reason.
Rory Benjamin Fox - Fox isn't my cup of tea (it's also my cousins' last name), but Rory Benjamin is so handsome. I love it! I would say this combo is a really good one, and a little boy would probably love having Fox in his name too.
Jude Apollo ? // Jude Memphis ? // Jude Ezekiel ? // Jude ? ? I absolutely LOVE Jude. It doesn't seem to flow right with Apollo or Memphis, but Ezekiel is nice with it. Anyway, onto suggestions: Jude Andrew Carlisle, Jude Ezekiel West, Jude Apollo Vincent, Jude Memphis Hayes, Jude Memphis Ian, Jude Apollo Samuel, Jude Ezekiel Garrett?
Stellan Walter Wren // Stellan ? Wren - I love Stellan, and Wren is okay but has a bit of a feminine feel to me. Stellan Walter Wren is nice, though, with the masculinity of Walter balancing out the unisex Wren. Suggestions: Stellan Zachary Wren, Stellan Timothy Wren, Stellan Carter Wren, Stellan Jacob Wren? Side note, it would be cool if you did Stellan Walter Andrew or Stellan Walter Allan or something and ended up with a last name that starts with T, because then his initials could be SWAT haha.
? Gavin Shelby - I agree that Shelby sounds feminine, especially since I've known two female Shelley's, and it sounds so similar. But if you pair two masculine names with it, I see no problem. Christopher Gavin Shelby, Carson Shelby Gavin, Samuel Gavin Shelby, Frederick Gavin Shelby, Leo Gavin Shelby, Theodore Gavin Shelby, Thomas Gavin Shelby, Noah Gavin Shelby?
? ? Memphis - Despite Memphis not being my style, I think it's handsome and if it were a first the nickname Mem is cute. As always, it kind of depends on your style what names you would want here, especially in the first spot, but I'll make a few suggestions anyway. Ezra Hayden Memphis, Hayden Lee Memphis, Carter/Carson John Memphis, Zachary David Memphis, Thomas Cole Memphis?
Silas ? ? - Silas has been growing on me since I first saw it. Silas Kellan Joseph would be really handsome. Others: Silas Peter Gale, Silas Dean William, Silas Daniel Ethan?
Forrest ? ?"Four" - Honestly, as much as I like this, it's in a guilty pleasure sort of way. It would be super cool as a teenager, a little awkward but cute as a kid, and as an adult, it would take a special guy to pull it off. But if you pair it with fairly common middles, he could always drop the nickname/first name and go by one of those if he ends up disliking it. Suggestions: Forrest Connor Tate, Forrest Henry James, Forrest Oliver Jacob/Jason, Forrest Jeremiah Seth?
Uriah ? ? - This one has grown on me since Divergent, though I don't think I would use it. Suggestions: Uriah Carson Felix, Uriah Joseph Hale, Uriah Benjamin Lee?
Good luck with your combos!