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I think Cannie could. Or it would work with Cotherine. But imo you don't get Connie out of Catherine unless your accent makes the "a" & "o" sound alike (Isabel / Isobel).

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In fact it could work in France, where the nn rules are very permissive. I know a Lea (leh-a, "eh" like "men") nn Lili, and though my first name is Claire some friends call me Cici (si-si).