Judas Iscariot
There are several explanations as to why Judas betrayed Jesus. In the earliest account, in the Gospel of Mark, when he goes to the chief priests to betray Jesus, he is offered money as a reward, but it is not clear that money is his motivation. In the Gospel of Matthew account, on the other hand, he asks what they will pay him for handing Jesus over. In the Gospel of Luke and the Gospel of John, the devil enters into Judas, causing him to offer to betray Jesus. The Gospel of John account has Judas complaining that money has been spent on expensive perfumes to anoint Jesus which could have been spent on the poor, but adds that he was the keeper of the apostles' purse and used to steal from it.
Yeshu
Robert Eisler considered the name to be derived from Pandaros. He also argued that it may not have been a real name but instead as a generic name for a betrayer. He notes that in the "Iliad", Pandaros betrays the Greeks and breaks a truce confirmed by solemn oath. He argues that the name came to be used as a generic term for a betrayer and was borrowed by Hebrew. The name is indeed found in "Genesis Rabba 50" in the expression "qol Pandar" (literally "voice of Pandaros" denoting false promises of a betrayer) used as a derogatory placeholder name for a judge of Sodom. The "-a" at the end of the form Pandera can be understood to be the Aramaic definite article.