Only the first letter should match, then the rest of it is pronounced like a word, in whatever pronunciation sounds coolest.
Also, all abbreviations should be pronounced like words, that’s why we have those new Internet abbreviation words like “loll”, “lemow”, “roffle”, “roff-lemow” “wutf” etc.
“I need to charge my phone, do you have an usba to usbsy cable?”.
I hope you’re pronouncing that as “jiggles” :D