If 'yellow' is spelled Y-E-L-L-O-W, and 'fellow' is spelled F-E-L-L-O-W, then 'hello' should be spelled H-E-L-L-O-W, amirite?

Cello is spelled C-E-L-L-O

I spell it like that, sadly(;

But then I can't spell it on my calculator! :(

and there is M-E-L-L-O-W :) AND BELLOW BUT ITS JELLO NOT JELLOW :)

The english language has many words that are like that. Just because it got made in europe where here are so many languages, English took many words from many languages. Therefore, you just need to memorize words.

but... it is :/