Ardo's name day is observed on March 7 in Croatia and on October 31 in Estonia.
The name Ardo is infrequently encountered in the USA, lacking significant historical traction within American naming patterns. Its origins suggest a foundation in older Germanic linguistic structures, hinting at historical depth rather than modern invention. The tone associated with Ardo is generally perceived as strong, direct, and somewhat vintage due to its brief, consonant-heavy structure. Classification worldwide leans heavily toward a masculine designation, rarely appearing as female or unisex. This name carries a grounded vibe, reflecting its concise sound profile. Ardo remains largely outside mainstream American naming trends.
| Country | Day | Month | Names |
 Spain | 7 | February | Moisés, Ricardo |
 Estonia | 20 | February | Meinhard, Meino, Ardi, Hardi, Hardo, Kardo |
 Italy | 19 | March | Edoardo il martire |
| Italy | 3 | April | Riccardo |
 USA | 3 | April | Dick, Dickson, Dix, Dixie, Dixon, Doris, Ricarda, Ricardo, Rich, Richard, Richelle, Richman, Rick, Rickey, Ricky, Rosamond, Rosamund, Ryan |
| Spain | 1 | May | Berta, Tamar, Tamara, Oroncio, Andeoro, Teodardo, Paciencia |
| Italy | 5 | May | Gottardo |
| Spain | 28 | May | Agustín, Bernardo, Emilio, Germán |
 Croatia | 8 | June | Dijana, Cecilija, Medardo, Vilim |
| Italy | 8 | June | Medardo |
 Austria | 10 | June | Bardo, Diana, Heinrich, Heinz |
| Italy | 20 | August | Bernardo di Chiaravalle |
| Spain | 20 | August | Bernardo Abad |
| USA | 20 | August | Barnard, Bernard, Bernardo, Filbert, Philbert, Rey, Reyna, Reynalda, Reynaldo, Reynold |
| USA | 25 | August | Dorcas, Lanard, Lennie, Lenny, Leonard, Leonardo, Tabatha, Tabitha |
| USA | 1 | September | Debbie, Deborah, Debra, Edgar, Edgardo, Giles, Josh, Joshua, Josue, Ruth |
| Spain | 24 | September | Gerardo, Mercedes |
| Italy | 3 | October | Gerardo di Brogne |
| Italy | 13 | October | Edoardo il confessore |
| Spain | 13 | October | Eduardo |
| USA | 13 | October | Eddie, Eddy, Eduardo, Edward, Edwardine, Ned |
| USA | 16 | October | Avice, Avis, Gerar, Gerard, Gerardo, Gerrard, Hedda, Hedwig, Hedy, Heide, Heidi, Jerard, Noah, Noe |
| Spain | 25 | October | Bernardo Calvó |
 Greece | 6 | November | Leonardo |
| Italy | 6 | November | Leonardo di Noblac |
| Spain | 6 | November | Leonardo |
| Estonia | 10 | November | Martin, Mart, Mardi, Mardo, Märten, Märt |
 Poland | 21 | November | Albert, Alberta, Albertyna, Janusz, Konrad, Konrada, Maria, Piotr, Regina, Rena, Rufus, Twardosław, Wiesław |
| Croatia | 26 | November | Konrad, Leonardo, Dubravko |