The name may be "Yasunari". In spanish speaking country this name tend to be pronounced like "Jasunari", right? Jasunari is not a Japanese name, but Yasunari can be frequently found. We don't know the meaning unless we know the Kanjis to be used for the name. But the most probable combinations are 康成、安成、泰成 etc. The meaning is peace and accomplishment more or less.