The NameDays in USA for May present a rich tapestry of names, frequently organized around variations of a single root. Many days feature families of names such as the numerous "Jo-" derivatives (Jodi, Joan, Jolene) and "Ash-" names (Ashley, Ashton). May 16 is particularly notable for its extensive collection of "Brand" and "Brend" variations, representing the highest number for a single day. The list encompasses a broad spectrum, from traditional selections like Harold, Judith, and Sophia to modern interpretations. Overall, the May NameDays highlight the prevalence of linguistic evolution within naming traditions, showcasing both classic appeal and diverse spellings.
| Country | Day | Month | Names |
 USA | 1 | May | Mae, May, Patience, Sigmund, Sigmunda |
| USA | 2 | May | Bing, Zoe, Zoey, Zolita |
| USA | 3 | May | Joletta, Trey, Troy, Viola, Violet, Violetta, Yolanda |
| USA | 4 | May | Mona, Monica, Monika, Monique, Monita, Web, Webb, Webster |
| USA | 5 | May | Jodi, Jodie, Jody, Judie, Judith, Judy, Terrell, Tyrell, Tyrese, Tyron, Tyrone, Tyrrell, Tyson |
| USA | 6 | May | Morna, Mya, Myah, Myrna, Orson, Prudence |
| USA | 7 | May | Ahern, Cooper, Dexter, Gisela, Gisella, Giselle, Gisselle, Hearne, Herne, Heron |
| USA | 8 | May | Acacia, Ace, Hal, Harold, Harriet, Harris, Harrison, Harry, Hattie |
| USA | 9 | May | Casandra, Cassandra, Grizelda, Kasandra, Kassandra, Zelda |
| USA | 10 | May | Cormac, Cormick, Gordon, Job, Joby, Jobina, Max, Maximilian, Maximus, Maxine, Maxwell |
| USA | 11 | May | Asa, Ervin, Erwin, Irvin, Irving, Irwing, Marlo, Marlon, Marlow, Marvin, Merle, Merlin, Mervin |
| USA | 12 | May | Achilla, Achilles, Grady, Grant, Kelby, Kellen |
| USA | 13 | May | Imani, Imelda, Imogene, Payton, Peyton |
| USA | 14 | May | Asher, Ashlee, Ashleigh, Ashley, Ashlie, Ashlyn, Ashlynn, Ashton, Berk, Berkeley, Bourke, Burgess, Burke |
| USA | 15 | May | Sofia, Sonia, Sonya, Sophia, Sophie, Ward, Wardell |
| USA | 16 | May | Brand, Branden, Brandi, Brandon, Brandy, Brannon, Brant, Brenda, Brendan, Brenden, Brendon, Brenna, Brennan, Brent, Brenton |
| USA | 17 | May | Pascal, Pascha, Pascual, Turner |
| USA | 18 | May | Aric, Eric, Erica, Erich, Erick, Ericka, Erik, Erika, Perry |
| USA | 19 | May | Dumont, Duncan, Dunstan, Indigo, Ivar, Ives, Wright, Yves |
| USA | 20 | May | Bernadette, Bernardina, Bernardine, Bernetta, Bernita |
| USA | 21 | May | Adelric, Adiel, Audric, Keaton, Kendrick |
| USA | 22 | May | Jolee, Joleen, Jolene, Jolie, Marshall |
| USA | 23 | May | Allard, Desirae, Desire, Desiree |
| USA | 24 | May | Chelsea, Chelsey, Chelsie, Landen, Landon |
| USA | 25 | May | Madalyn, Madeleine, Madeline, Madelyn, Madilyn, Marlee, Marleen, Marlena, Marlene, Marley |
| USA | 26 | May | Felipe, Flip, Phil, Philip, Philippa, Phillip |
| USA | 27 | May | Broderick, Brodie, Brody, Isador, Isadora, Isadore, Isidro |
| USA | 28 | May | Bevan, Bevis, Emil, Emiliano, Emilio, Faron, Ferrin, Ferron |
| USA | 29 | May | Duana, Duane, Duanna, Dwayne, Fitz, Fitzerald |
| USA | 30 | May | Joan, Joani, Joann, Joanna, Joanne, Johanna, Fawn, Fern, Fernanda, Fernando, Ferdinand, Ferdinanda, Ferdinando |
| USA | 31 | May | Camila, Camilla, Camille, Petra, Petronella, Pier |
