December's NameDays feature a rich diversity of names, often appearing in numerous variations on a single day. Many days highlight extensive name families, such as the ten variations of Nicholas and its feminine forms on December 6, or the thirteen forms related to Stephen on December 26. Other prominent groups include the Jasmine and Emily families, alongside Adela and Esther variations. Traditional names like David and Adam are frequently celebrated throughout the month. The collection culminates with a festive touch on December 25, featuring Noel, Holly, and Jesus, alongside classic names like Anastasia and Stacey.
| 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 |
