Did too...
Pilate was educated.. mostly only romans spoke Latin.. the world (in them there parts) spoke koine greek.. so did Pilate so the "people" would understand him.. Most/many rabbis probably spoke latin, Greek and hebrew.. Iesus <- Greek for "Jesus".. more or less.. all the "J's" came during and after 313 ad when the Roman Catholic church was created.. d;-)
Considering the Aramaic would be Yeshua (Joshua... fulfills an O.T. prophecy according to some interpretations), the Iesus of Greek would be closer to the actual sound of the name than the Latinized Jesus. It's worth noting that "Jesus" is as translated a word as the name Ivan is for John or Raymond is for Raimondo...
In Acts 21.37, Paul speaks to the Roman tribune ("chiliarch" or commander of 1,000 according to the Greek text) and the tribune responds in surprise, "You know Greek?" so obviously Paul had been speaking to him in Greek.
It was common in that era for educated Romans to be fluent in Greek...they started studying Greek at a young age.