Are matt leblanc from the series Friends and Christian Leblanc from the young and the restless brothers?
No, although they share the same last name, the two are not related. Matt Leblanc, born 1967, was born and raised in Masschusetts and is the son of Paul Leblanc. Christian J. Leblanc was born in 1958 in North Carolina and is the son of Andre Leblanc. There is no relation.
I hope this helps!