Cyd: Name day
Name Day List: Cyd
| Country | Day | Month | Names |
 USA | 20 | February | Aimee, Alaric, Alarica, Alarice, Aimee, Ami, Amy, Amya, Cyd, Cydney, Desmond, Sid, Sidney, Sydnee, Sydney, Ulric |
Name Day List - similar names (Cyd)
| Country | Day | Month | Names |
 Poland | 11 | July | Benedykt, Cyprian, Kalina, Kallina, Kir, Olga, Pelagia, Pelagiusz, Pius, Placyd, Sawin, Wyszesława |
| Poland | 5 | October | Apolinary, Częstogniew, Donat, Donata, Faust, Fides, Flawia, Igor, Justyn, Konstancjusz, Konstans, Placyd |
| Poland | 11 | October | Aldona, Brunon, Burchard, Dobromiła, Emil, Emilian, Emiliusz, Germanik, Maria, Marian, Placydia |