In Japan, the use of names is an important aspect of etiquette. Honorifics are used to show respect for those who are older or of higher status. Using first names is considered informal and should only be used with permission or in casual settings. Age and social status also play a role in how people address each other. To avoid offending someone, it's best to use last names and honorifics when addressing others and to consider context when deciding whether using a first name is appropriate.