The name Jesus or Iesous in Greek was often abbreviated with the Greek letters iota-eta-sigma. The iota sometimes got transliterated as J, the eta looked like an H, and the sigma sometimes appeared as a variant that looked like a C rather than the typical sigma. Hence JHC, which some took to mean Jesus H. Christ.
That is correct.
The original Hebrew name is Yeshu.
Greeks don't use the pronunciation "sh" so they transliterated it as "iesou" but Greek male names end with the letter "s" as "Josephus" "Cassius", etc, so the transliterated name ended as Iesous.
Greeks abbreviated the title Christ as Xto. From here comes the modern Xmas sign (Christ-Mass=Christmas).
Greeks and Hebrews don't have a letter "j", however Greeks have words with "j" letter sound, as well as Hebrews. The word Hanukah actually is pronounced with a first sound like pulling mucus with your throat out and "H"anukah sounds like dog's grunt sound at its beginning.
This kind of rare pronunciation happened also when the bible was translated to the worst language to be adapted for Hebrew pronunciation by Johannes Gutenberg: German.
Here the name YHWH was pronounced Iave, because Germans have trouble with the letter "u". Then, rather than "Dauid" (which is a more close pronunciation according to me) it was transliterated as "David".
Here is the Jewish joke about tourists in Hawaii, so you will see better what I'm talking about.
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Two tourists (one of them a German and the another Italian) went to Hawaii for vacations. After a few days in the island, one of them commented how great were relaxing in Havaii.
-It's Hawaii, said the another.
-No, it's Havaii.
After discussing longer than Humbleman with others about relativity in "Elsewhere" section of Talk Free Thought forums, they agreed to find an aborigine of the island and ask him how the name of that land was pronounced.
Going here and there, they found a fisherman who had the appearance of being a native of the island.
-Excuse me sir -asked the Italian tourist - how do you pronounce the name of this island: Hawaii or Havai?
-Havai, of course, answered the fisherman.
-Did you see? -said the German- I told you the name is Havai.
They left the place going to the hotel, when the Italian had a concern, so he returned back to the fisherman to ask one more question.
-Excuse me again sir, can you tell me how long are you in this island?
-Two veeks -responded the fisherman.