No, They are different names, although both go back to ancient Hebrew. Johann is a German form of the name "John", which comes ultimately from the Hebrew Yohanan, meaning "God has favored". Joseph comes from the Hebrew Yoseph, which means "God increases".
Christopher DesRoches's birth name is Christopher Joseph DesRoches.
Johann Joseph Hoffmann died in 1878.
Johann Joseph Hoffmann was born in 1805.
Johann Joseph Couven was born in 1701.
Johann Joseph Vilsmayr died in 1722.
Johann Joseph Vilsmayr was born in 1663.
Johann Joseph Thalherr was born in 1730.
Johann Joseph Peyritsch died in 1889.
Johann Joseph Peyritsch was born in 1835.
Johann Joseph Gassner was born in 1727.
Johann Joseph Christian died in 1777.
Johann Joseph Christian was born in 1706.