This started as a solo project of Eric Fish, but he was soon joined by guests that eventually became members of the project.
Therfor, the naming was not consistent throughout the years:
While it started as "Eric Fish" soon " & Freunde" (German for " & Friends" ) got attached, occasionally leaving the "Eric" part out. Later the English versions "(Eric )Fish & Friends" were preferred over the German ones.
Since there never was an official "change of name" but the names are used more or less interchangable with different preferences over time, this is considered one group/project and thus one artist with different credit for the different releases.