I am currently expecting my third child in [name_u]November[/name_u]. We are having a difficult time with boy names! I want something different and unique but not strange. I like names containing a Y but it is not a must. Sibling names are [name_m]Ryker[/name_m] and [name_u]Paisley[/name_u]. Names considering: [name_m]McCoy[/name_m] (call him [name_m]Coy[/name_m]), [name_m]Knox[/name_m], [name_m]Greyson[/name_m] (husband doesn’t like), [name_u]Sawyer[/name_u] (to common). Also middle name is [name_m]Jasper[/name_m] if that helps! Thanks in advance!! 
[name_m]McCoy[/name_m] is really cool and unique! I assume your last name isn’t a “Mc_” or that would be too much! It’s different but not strange.
I’d also like to suggest a few I think go with his siblings names:
[name_m]Elwood[/name_m]
[name_m]Roswell[/name_m] ([name_f]Roz[/name_f])
[name_m]Weston[/name_m]
From your choices I think [name_m]Knox[/name_m] [name_m]Jasper[/name_m] goes best with your other children. Some other options I think would pair nicely:
[name_m]Ryker[/name_m], [name_u]Paisley[/name_u], and
[name_m]Wyatt[/name_m] [name_m]Jasper[/name_m]
[name_m]Levi[/name_m] [name_m]Jasper[/name_m]
[name_m]Weston[/name_m] [name_m]Jasper[/name_m]
[name_m]Gavin[/name_m] [name_m]Jasper[/name_m]
[name_u]Dylan[/name_u] [name_m]Jasper[/name_m]
[name_u]Quinn[/name_u] [name_m]Jasper[/name_m]
[name_u]Avery[/name_u] [name_m]Jasper[/name_m]
Good [name_m]Luck[/name_m]! 
Maybe these could be some options for you:
[name_m]Bryant[/name_m]
Kaynen / Caynan
Coyson
Coylen
[name_m]Zayne[/name_m]
[name_m]Wayde[/name_m]
[name_m]Hanley[/name_m]
Dayley
[name_m]Yancy[/name_m]
[name_u]Schuyler[/name_u]
[name_m]Gavyn[/name_m] [name_m]Jasper[/name_m]
[name_m]Bryson[/name_m] [name_m]Jasper[/name_m]
[name_m]Ryker[/name_m], [name_u]Paisley[/name_u], Coyson
I vote [name_m]McCoy[/name_m] or [name_m]Knox[/name_m]! Either one sounds good with [name_m]Jasper[/name_m].
[name_m]How[/name_m] about-
[name_m]Boyd[/name_m]
[name_m]Doyle[/name_m]
[name_m]Raiden[/name_m]
[name_m]Amyas[/name_m]
[name_m]Brogan[/name_m]
[name_m]Boden[/name_m]
[name_m]Cyrus[/name_m]
[name_m]Lysander[/name_m]
[name_m]Wilder[/name_m]
[name_m]Griffith[/name_m]
I like [name_m]Knox[/name_m] & [name_u]Sawyer[/name_u] best!
What about:
[name_u]Gentry[/name_u]
[name_u]Layne[/name_u]
[name_u]Lyle[/name_u]
Syre
[name_u]Flynn[/name_u] or [name_m]Fynn[/name_m]
Hmmmm…
[name_u]Bryce[/name_u]
[name_u]Bentley[/name_u]
[name_m]Lawson[/name_m]
Hyland
[name_m]Kyler[/name_m]
[name_m]Deacon[/name_m]
[name_m]Palmer[/name_m]
[name_m]Zane[/name_m]
[name_m]Hayes[/name_m]
[name_m]Gannon[/name_m]
[name_u]Corey[/name_u]
[name_f]Baylor[/name_f]
[name_u]Tyler[/name_u]
[name_u]Tyson[/name_u]
[name_m]Holden[/name_m]
[name_u]Grady[/name_u]
[name_m]Brody[/name_m]
[name_u]Wade[/name_u]
[name_u]Remy[/name_u]
[name_m]Harrison[/name_m] nn. [name_m]Harry[/name_m]
I have a friend named Wrigley, I think its perfect for your sibset (& criteria)
Wrigley [name_m]Jasper[/name_m]
What are thoughts on name [name_m]Beau[/name_m]? [name_m]Beau[/name_m] [name_m]Jasper[/name_m]? I’m still a fan of [name_m]Knox[/name_m] & [name_m]McCoy[/name_m] but hubby isn’t thrilled.