| Country | Day | Month | Names |
 USA | 1 | December | Bianca, Blanca, Blanche, Eli, Ely, Sherwin |
| USA | 2 | December | Tayler, Taylor, Todd, Vita, Vivian, Viviana |
| USA | 3 | December | Javier, Malcolm, Malcom, Malik, Xavier, Xaviera |
| USA | 4 | December | Ada, Adah, Adina, Aida, Babette, Barbara, Barbie, Barbra, Osman, Osmond |
| USA | 5 | December | Pandora, Sabas, Savas, Wallace, Wally, Walt, Walter |
| USA | 6 | December | Claus, Ira, Nicholas, Nichole, Nick, Nicklaus, Nickolas, Nico, Nicolas, Nicole, Nicolette, Nikki, Niko, Nikolas |
| USA | 7 | December | Ambrose, Ambrosine, Jasmin, Jasmine, Jazlyn, Jazmin, Jazmine, Yasmeen, Yasmin, Yasmine, Yazmin |
| USA | 8 | December | Rohan, Spence, Spencer, Spenser |
| USA | 9 | December | Delfina, Delfino, Delphina, Kirby, Kirk, Kirkwood |
| USA | 10 | December | Emely, Emilee, Emilia, Emilie, Emily, Eula, Eulalia, Ula |
| USA | 11 | December | Art, Arthur, Arthurine, Arturo, Javon, Jevon, Sage |
| USA | 12 | December | Finley, Finn, Fiona, Guadalupe, Lupe, Lupita, Mekhi |
| USA | 13 | December | Cinderella, Cindy, Cynth, Cynthia |
| USA | 14 | December | Boyd, Boyden, Byrd, Horace |
| USA | 15 | December | Adlai, Adler, Carney, Mirella, Mireya, Tanner |
| USA | 16 | December | Addie, Addy, Adela, Adelaide, Adele, Adeline, Adella, Adelle, Alena, Alina, Aline, Della |
| USA | 17 | December | Eleazar, Lazar, Lazaro, Lazarus, Olympia, Orval, Orville, Storm, Stormie, Stormy, Wilbert, Wilberta, Wilbur |
| USA | 18 | December | Griffin, Griffith, Ruff, Rufina, Rufus, Russ, Russell, Rusti, Rusty, Ty, Tyrus |
| USA | 19 | December | Daria, Darian, Darien, Dario, Darion, Darius, Haysten |
| USA | 20 | December | Ammon, Roxana, Roxanne, Roxie |
| USA | 21 | December | Estella, Estelle, Ester, Esther, Star, Stella, Van, Vance, Vanesa, Vaness, Vanna |
| USA | 22 | December | Asta, Astrid, Trista, Tristan, Tristen, Tristin, Triston |
| USA | 23 | December | Hart, Hartman, Latoya, Wade |
| USA | 24 | December | Adan, Adana, Adam, Adamina, Addison, Ava, Eva, Eve, Evelyn |
| USA | 25 | December | Anastasia, Noel, Noelle, Hollie, Holly, Jesus, Stacey, Stacie, Stacy |
| USA | 26 | December | Esteban, Estefania, Estefany, Estevan, Stefan, Stefanie, Stephan, Stephanie, Stephany, Stephen, Steve, Steven, Stevie |
| USA | 27 | December | Adwin, Alvern, Alverna, Alvin, Alvina, Alwin, Elvin, Elvina, Elvira, Elvita, Elwin |
| USA | 28 | December | Aspen, Caspar, Gaspar, Innocent, Jasper, Kasper, Woodrow, Woody |
| USA | 29 | December | Dave, David, Davida, Davion, Davis, Davy, Dawson, Dayton, Jess, Jesse, Jessie, Jessica, Jessy, Vida |
| USA | 30 | December | Ainsley, Kelsa, Kelsey, Kelsi, Kelsie, Mason |
| USA | 31 | December | Malone, Melania, Melanie, Melany, Silas, Silvester, Sylvester |
