ψ is the letter psi and stands for the sound /ps/.
The English name "omicron" has a "c" in it because the name came to us through Latin, which uses "c" for the /k/ sound. Greek has no "c" letter and so the word is spelled όμικρον, which might have been "omikron" in English if the word had been borrowed directly.
"omipsron" makes no sense.
U hv splitscreen in settings, beneath is where u press where its says english and u hold and it pops up ur!languages enabled