This question can be tricky because us English speakers all over the world have different ways of pronouncing different words with different accents. And it's not necessarily right or wrong, while a linguist or a historian might insist on the Italian pronunciation of the originally Italian word, okarina, it's not unusual to encounter an alternate pronunciation of akarina in other languages or dialects. At the end of the day, we care the most about the sound the instrument makes, unless about the sound that your mouth makes to identify it.