English pet name for Cecily, from Latin "blind".

Many correspondents have shown that this pet name is very frequently used for the only girl in a family of boys, i.e. a homophone for "sis", the abbreviation of "sister".

See also Cissie/Cissy and Sis/Sissie.

One correspondent [DE] has an example of Cis/Cissie being used as a pet name for Christian. Although we believe this to be rare it is worth noting as a possible forename when searching records.