Louis: Name day
Name Day List: Louis
| Country | Day | Month | Names |
 USA | 4 | January | Angel, Angela, Angelica, Angelina, Angeline, Angelique, Angelo, Angie, Dangelo, Deangelo, Lewis, Lou, Louie, Louis, Luis |
 France | 25 | August | Louis |
Name Day List - similar names (Louis)
| Country | Day | Month | Names |
| France | 15 | March | Louise |
| USA | 15 | March | Eloise, Lois, Louella, Louisa, Louise, Luella, Luisa, Lulu |
 Norway | 25 | August | Louise, Lovise, Ludvig |
 Sweden | 25 | August | Louise, Lovisa |
 Greece | 22 | September | Fokas, Louise, Louiza |
 Denmark | 31 | October | Louise |
 Ukraine | 13 | December | Louise, Lukia, Lucia |