Zeus was a Greek god, Iseous was a Roman god and Jesus is the Christian faith Messiah, who is also referred to as "Son of Man." My question is: What is the origin of the name Jesus, and what is its relationship with Zeus and Iseous?
Jesus is the Medieval Latin spelling of Iesus (the 'i' is consonantal), itself derived from the Greek Ἰησοῦς, as bleh noted, which transcribed in Latin characters would be Iesous, close to your Iseous (which does not otherwise exist as a name).
The name is ultimately Semitic, and came into Greek as the Aramaic שׁוּעַ (Yeshua), from the Hebrew יְהוֹשֻׁעַ (Yehoshuah, which in English we usually "translate" to Joshua).
There is no relationship between that name and Zeus, which is proto-Indo-European and only looks similar to Iesus in its late form—its stem is dio- (whence Dios "of Zeus", and its many derivatives in names like Dionysus and Diomedes or even Dioscuri, the two "sons of Zeus"). This name ultimately comes from the PIE root *dewos, and is related to the Latin deus, Old Persian daiva-, both words for god, as well as the Latin dies or Russian день (dyen') meaning "day".
Zeus is Greek. This Iseous guy does not seem to exist.
As for the origin of the name Jesus, well Iseous seems to play a role here interestingly.
Jesus in Greek means "Joshua" in another language (Arabic I think). Iseous is another name for Joshua, and sort of looks like "Ιησούς" (Jesus in Greek).
Jesus means God saves, if that's any help.