Cyndie?
Cindy?
"Cinda, Cindee, Cindi, Cindie, Cindy, Cinnie, Cinny, Cinthia, Cintia, Cinzia, Cyn, Cynda, Cyndee, Cyndia, Cyndie, Cyndra, Cyndy, Cynnie, Cynthea, Cynthie, Cynthya, Cyntia, Cytia, Kynthia, Kynthija, Sindee, Sindi, Sindy, Sindya, Sinnie, Sinnie, Sinny, Synda, Syndee, Syndi, Syndy, Syntha, Synthee, Syntheea, Synthia, Synthie and Synthya." <= 42 variant forms of Cynthia.