Sure, that's a given. I misunderstood because the original poster said, "That's how Sonny is pronounced here" [to rhyme with Bonnie] as though she lived in an English-speaking area where Sonny is a common word. If she'd said "In my language, Sonny would rhyme with Bonnie," that would have made perfect sense.
Keep in mind that not everyone on this board knows where others live and what their native language is. There can even be confusion among pronunciations in different English dialects.