| Country | Day | Month | Names |
 USA | 1 | January | Arleen, Arlen, Arlene, Arlette, Pablo, Paul, Saul |
| USA | 2 | January | Abel, Abelard, Abella, Abner, Marsten, Marston, Raven |
| USA | 3 | January | Gaynor, Geneva, Genevieve, Guenna, Jenifer, Jenna, Jennie, Jennifer, Jenny |
| USA | 4 | January | Angel, Angela, Angelica, Angelina, Angeline, Angelique, Angelo, Angie, Dangelo, Deangelo, Lewis, Lou, Louie, Louis, Luis |
| USA | 5 | January | Ladarius, Ladd, Laird, Lamont, Lane, Tania, Tanya, Tatiana, Tatyana, Tawni, Tawnya, Tia, Tiana, Tianna, Tonya |
| USA | 6 | January | Cheyanne, Cheyenne, Howell, Hoyle, Kahlil, Khalil, Melchior, Rowan, Talullah, Tiffani, Tiffanie, Tiffany |
| USA | 7 | January | Alda, Aldea, Alden, Aldo, Aldric, Canute, Knut, Knute, Millard, Miller |
| USA | 8 | January | Alvis, Elvis, Severin, Severina, Severne |
| USA | 9 | January | Belinda, Linda, Lindy, Malinda, Melina, Melinda, Minda, Mindee, Mindie, Mindy, Olinda |
| USA | 10 | January | Bethany, Darby, Derby, Dermot, Kermit, Kermore, Rhett |
| USA | 11 | January | Annora, Chaya, Honey, Honora, Honoria, Nora |
| USA | 12 | January | Alain, Alaina, Alan, Alana, Alanna, Alayna, Allan, Allen, Allena, Lana, Lanna |
| USA | 13 | January | Ivette, Veronica, Vonnie, Vonny, Yvette, Yvonne |
| USA | 14 | January | Alair, Felice, Felicia, Felicity, Felix, Hilary, Hillary, Hillery |
| USA | 15 | January | Deidre, Deirdre, Deja, Marten, Martin, Marty |
| USA | 16 | January | Aaliyah, Aleah, Aliyah, Paine, Payne, Phillis, Phyllis, Pilar, Priscilla |
| USA | 17 | January | Anthony, Antoine, Antoinette, Anton, Antonia, Antonio, Antony, Antwan, Ben, Benita, Benito, Benjamin, Bennie, Benny, Toni, Tony |
| USA | 18 | January | Faustina, Faustine, Fraser, Fraze |
| USA | 19 | January | Bob, Bobbi, Bobbie, Bobby, Robbie, Robert, Roberta, Roberto, Robin, Robinson, Robyn |
| USA | 20 | January | Fabia, Fabian, Fabiola, Sebastian, Sebastiana |
| USA | 21 | January | Agnes, Ethan, Inez, Mayer, Maynard, Ynez |
| USA | 22 | January | Enoch, Piper, Vicenta, Vicente, Vince, Vincent, Vincentia, Vincenzo, Vinnie |
| USA | 23 | January | Emerald, Esmeralda, Rachael, Rachel, Rachelle, Rae, Ramon, Ramona, Raquel, Ray, Raymond, Raymundo |
| USA | 24 | January | Oral, Orel, Tim, Timmy, Timon, Timothy, Vera, Verena |
| USA | 25 | January | Amari, Amir, Amira, Amarion, Gwayne, Hakon, Hawk, Jamari, Prince, Princess |
| USA | 26 | January | Aubrey, Conan, Coner, Conner, Connor, Conor, Gonzalo, Paola, Paula, Paulette, Paulina, Pauline |
| USA | 27 | January | Buck, Buckley, Floyd, Keith, Lloyd, Logan |
| USA | 28 | January | Carlotta, Charleen, Charlene, Charlotta, Charlotte, Charmaine, Manfred |
| USA | 29 | January | Gilda, Goldie, Sheldon, Shelley, Shelly, Shelton, Ophrah, Oprah |
| USA | 30 | January | Franklin, Franklyn, Freeman, Fremont, Marteena, Martina, Martine |
| USA | 31 | January | Cyrus, Kira, Kyra, Lona, Loni, Lonnie, Scarlett, Zane |
