No, Joey is not Japanese. Joey is a common English name and can be used by people of any nationality.
Technically yeah, because he's half Filipino and half Portuguese (Filipino is Asian..)
Joey Graceffa goes by Gandfather Joey, Joey, and Grandfather.
Joey Granati goes by Joe.
Joey Salmingo goes by Joey.
Joey Tufaro goes by Joey.
Joey Pollari goes by Joey.
Joey Bishop - a comic; Joey Hetherington - a dancer
Joey Magliano went by Jumping Joey.
Joey Deleon goes by Joey DeLeon.
Joey Rassool goes by Joey Rassool.
Joey Monasterios goes by Joey Tron.