Hey there!

I do genealogy so I should be able to provide a few information.

Hosti is of French origin and would have its origin from the French "Hôte"; host. As far as I know, the origin would be in Bretagne in France (North East).

If you have any more questions, do not hesitate! Where are you from? Canada? United States? Which province or State? Depending, I might be able to look how the family ended up in your general region.