G I R L S

• Arlo, Arrow
• Beau
• Cairo, Calypso, Chicago, Cleo, Clio, Coco,
• Domino,
• Echo,
• Flo,
• Geo, Gio,
• Halo, Harlow, Hero,
• Indigo, Io,
• Jo, Juno,
• Koko,
• Margaux, Margo, Margot, Marlo, Marlowe, Meadow, Milagro, Munro,
• Niko,
• Rainbow, Reignbeau, Rowe, Rio, Ro,
• Snow, Sparrow,
• Tupelo,
• Willow, Winslow,

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B O Y S

• Akiro, Alfonso, Alfonzo, Allegro, Almonzo, Alonzo, Angelo, Apollo, Arlo, Armando, Arrow, Audio
• Banjo, Bardo, Barlow, Beau, Benno, Bo, Bosco, Bruno
• Caetano, Cairo, Calypso, Cameo, Cato, Cosmo, Crow, Crowe,
• Dino, Django, Domino
• Echo, Eduardo, Eero, Elio, Emilio, Enzo
• Finlo, Francisco, Franco
• Galileo, Genisio, Geno, Geo, Geronimo, Gino, Gio
• Harlow, Hero, Hugo
• Indigo, Indio, Inigo
• Jago, Jango, Jericho
• Kelso, Kylo
• Laszlo, Lazlo, Leo, Leonardo, Lowe, Ludlow, Ludo
• Mario, Marlow, Matteo, Milo, Monaco, Monico, Morocco, Mungo, Munro
• Neo, Nero, Nico, Niko
• Orlando, Oslo, Otto, Ozlo
• Quinto, Quirino
• Rambo, Reno, Renzo, Ringo, Rio, Ro, Rocco, Rollo, Romeo, Row, Rowe,
• Sebastiano, Solo, Sparrow, Stowe,
• Teo, Tero, Theo, Tupelo
• Ugo, Urso
• Valentino, Viggo
• Waldo, Winslow, Woodrow,
• Xylo
• Yarrow,
• Zuko

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https://babynamewiki.net/blog/names-ending-in-o-sound

https://teamgroupnames.com/girl-names-ending-with-o/