Det er opphav til langt over 100 varianter av kvinnenavn, for eksempel: Caitlin, Caitlyn, Caisa, Caja, Cajsa, Cara, Caren, Cari, Carianne, Carin, Carina, Carine, Carna, Catalina, Catarina, Cate, Caterina, Caterine, Catharina, Catherina, Catherine, Cathinca, Cathinka, Cathleen, Cathrin, Cathrina, Cathrine, Cathy, Catinka, Catrin, Catrina, Catrine, Catriona, Ecaterina, Ekaterina, Jekaterina, Kaarina, Kaatje, Kaia, Kaisa, Kaja, Kajsa, Kaisu, Kaitlin, Kajsa, Kare, Kareen, Karen, Karete, Karethe, Karette, Kari, Karia, Kariane, Kariann, Karianne, Karin, Karina, Karine, Karna, Katalin, Katariina, Katarine, Katarzyna, Kate, Katelin, Katelina, Katelyn, Katerina, Katerine, Kateryna, Katharina, Katharine, Kathe, Katherin, Katherina, Katherine, Kathi, Kathie, Kathinka, Kathleen, Kathlen, Kathlyn, Kathrin, Kathrina, Kathrien, Kathryn, Kathy, Kati, Katia, Katica, Katie, Katina, Katinka, Katja, Katlyn, Katri, Katrin, Katrina, Katrine, Katsiaryna, Katti, Katty, Katy, Katya, Kaya, Ket, Keth, Kethlin, Kethy, Ketty, Kine, Kit, Kith, Kitt, Kitti, Kitty, Käte, Käthe, Riina, Thrine, Trina og Trine.