In Thailand, people have different names than you might be used to. Instead of having a first name and a last name, people in Thailand usually have one long name. This name is made up of two parts: the first part is the person's given name, which is chosen by their parents, and the second part is their family name, which is usually the name of their father.
So, for example, if someone's father's name is Somsak, their family name would be Somsak. If that person's given name is Aom, their full name would be Aom Somsak. When they introduce themselves, they would say "My name is Aom," but when they write their name or fill out official documents, they would write their full name, with the given name first and the family name second.
Sometimes, people in Thailand also have a nickname that is more commonly used than their given name. This nickname might be something that describes their personality, like "Sunny," or something that is a shortened version of their full name, like "Ao" for Aom.
It's important to keep in mind that Thai names can be quite long and may not be easy for non-native speakers to pronounce. But by taking the time to learn and use someone's full name, you are showing respect for their culture and identity.