Lou: Name day
Name Day List: Lou
| Country | Day | Month | Names |
 USA | 4 | January | Angel, Angela, Angelica, Angelina, Angeline, Angelique, Angelo, Angie, Dangelo, Deangelo, Lewis, Lou, Louie, Louis, Luis |
Name Day List - similar names (Lou)
| Country | Day | Month | Names |
 France | 11 | February | Lourdes |
 Spain | 11 | February | Dante, Lourdes, Adolfo |
| USA | 11 | February | Adolfo, Adolph, Adolpha, Alva, Alvarita, Alvaro, Lourdes |
 Italy | 12 | February | N.di Lourdes |
| France | 15 | March | Louise |
| USA | 15 | March | Eloise, Lois, Louella, Louisa, Louise, Luella, Luisa, Lulu |
| USA | 1 | June | Brigham, June, Junella, Marilee, Marilou, Marilu, Marilyn, Marylynn |
 Greece | 23 | June | Aristoklis, Loulou |
| France | 29 | July | Beatrix, Loup, Marthe |
| Greece | 11 | August | Efplous |
| France | 25 | August | Louis |
 Norway | 25 | August | Louise, Lovise, Ludvig |
 Sweden | 25 | August | Louise, Lovisa |
| France | 28 | August | Augustin, Elouan |
| Greece | 22 | September | Fokas, Louise, Louiza |
| Greece | 15 | October | Loukianos |
 Denmark | 31 | October | Louise |
 Ukraine | 13 | December | Louise, Lukia, Lucia |