Cecil (Engelse)
Sill
Silke (Duitse)
Seely
Cole, Gale, Ailie, Ailey, Ailee, Aila, Aili, Alle, Dila, Bilee, Cala, Cal, Cali, Calie, Calee, Mille, Caley, Cailie, Cailey, Caila, Silke, Cilly, Cilla, Cilia, Cilka, Cici, Celie, Cela, Ceileh, Ceila, Ceil, Cee, Cecile, Celes, Ciline, Chele, Chloe, Cloe