Just updating my 1911 Census Name Combos post with some 'C' names I came across some interesting 'Cas' names:
Cassibellanius
Cassibelaunus - both forms of Cassivellaunus, an ancient British chief.
Cassino
Cassiah
Cassidena
Cassido - yes, a girl, I checked.
Casilda / Cassilda - saints name
Cassileen
Casilla / Cassilla
Casina / Cassina - several place names in Italy.
Cassinet
Casiphia - a Babylonian place name identified in the Bible.
