Carolus Tessier

While looking through the church records for Our Lady of Lourdes church in Buffalo, New York,(FHC microfilm # 1292741) I came across a Carolus Tessier as the sponsor at a baptism.I have a couple questions that maybe you folks can help answer...

1.What does the name Carolus translate to in English... Caroll, Carl, Charles??
2.Does anyone know of Carolus might be a brother to my Jean Baptiste Tessier who would seem to be in Buffalo in the 1850's?
3.Is anyone researching Carolus Tessier?

Thanks for shedding some light on my dilemma.. Sara