Girls:

• Anne, Ash, Ave
• Barb, Bay, Bea, Beau, Bee, Beige, Bell, Belle, Bess, Beth, Bird, Blaine, Blair, Blaise, Blake, Blanche, Bliss, Bloom, Blue, Blythe, Bree, Breeze, Brie, Britt, Brooke, Bryce, Brynn, Byrd
• Cai, Cat, Cate, Claire, Clare, Cove
• Day, Dove, Drew
• Elle, Ellse, Eve, Eyre
• Faith, Fawn, Faye, Fern, Fleur
• Gael, Gail, Gayle, Grace, Gray, Green, Greer, Gwen
• Hope
• Jade, James, Jane, Jem, Jill, Jo, Joan, Joy, Jude, June
• Kai, Kat, Kate, Kay, Kaye, Kerr
• Lake, Lane, Lark, Leigh, Len, Lex, Lou, Love, Lux, Lynn
• Mae, Maude, Maeve, Mauve, May
• Neeve, Nell, Niamh, North, Nyx
• Paige, Pearl
• Quinn
• Rae, Ray, Reese, Ren, Rose, Roz, Ruth
• Sage, Shawn, Shay, Sloane, Snow
• Tess, Townes, Tru, True
• Val, Vale
• Wilde, Wren, Wylde, Wynn

https://minimalistmama.co/baby-names/one-syllable-girl-names#modern-one-syllable-girl-names

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Boys:

• Abe, Ace, Al, Ames, Arc, Arch, Art, Ash
• Bam, Banks, Bay, Bear, Beau, Beck, Bill, Birch, Blake, Blaine, Blaise, Blaze, Blue, Bo, Boone, Bram, Brave, Brent, Brett, Briggs, Brooks, Bru, Bryce, Buzz, Byrd
• Cade, Cai, Cain, Cal, Cale, Call, Cam, Camp, Cap, Case, Cash, Cass, Chance, Chase, Chris, Clark, Claude, Clay, Cloud, Clyde, Cole, Coy, Cree, Creed, Cress, Crew, Crue, Cy
• Dan, Dane, Dash, Dave, Dax, Dean, Drake, Drew, Duke, Dune
• Eames, Ed, Elm
• Finn, Finch, Flynn, Ford, Forge, Fox, Frank, Frost
• Gael, Gage, Gil, Grant, Gray, Green, Greer, Grey, Gus, Guy
• Hal, Hank, Hart, Hayes, Heath, Huck, Hugh
• Jace, Jack, Jag, Jake, James, Jay, Jeff, Jett, Jim, Joe, Joel, John, Jones, Jude
• Kai, Kamp, Kade, Kane, Keith, Kent, Key, King, Kip, Kit, Knox, Krew, Kroy, Kydd
• Laird, Laith, Lake, Lance, Lane, Lark, Layne, Lee, Leif, Leith, Len, Lev, Lex, Loch, Lou, Luck, Luke, Lynn
• Mac, Mack, Maks, March, Mark, Max, Moss
• Nash, Nate, Ned, Newt, Nick
• Oak, Oakes, Ott
• Paul, Pax, Penn, Phil, Pierce, Poe, Pratt, Price, Prince, Puck
• Quinn
• Radd, Rafe, Ralph, Ray, Reece, Reed, Reid, Ren, Rex, Rhodes, Rhys, Ridge, Rowe, Roy, Royce
• Sage, Saint, Sam, Saul, Sean, Seth, Shane, Shawn, Sid, Sixx, Smith, Steele, Stone, Storm, Stu
• Tag, Taj, Tate, Teague, Ted, Thad, Tim, Todd, Tom, Townes, Trace, Trent, Trey, Trigg, Tripp, Troy, True, Ty
• Vail, Val, Van, Vance, Vane, Vann, Vaughn, Venn, Verse, Vick, Vince, Von
• Wade, Wake, Walt, Watt, Wave, Wayne, Webb, Wells, Wes, West, Whit, Wilde, Will, Wirth, Wolf, Worth, Wright, Wylde, Wynn, Wynne
• Zack, Zane, Zeke, Zen, Zev

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https://nameberry.com/list/386/one-syllable-middle-names-for-boys