2000+ Boy Names That End in S

Cleophas is a variant of Cleopas, who was one of the men in the Bible who encountered Jesus on the road to Emmaus following his resurrection. As a name, it appeared on a handful of birth certificates each year during the mid-twentieth century, but it hasn't seen much use recently.

Hermione's cat in the Harry Potter series.

You'd have to be bold (or Welsh) to change the spelling of Francis like this... but it certainly stands out.