Was Kangxi called by later generations or said by people in Kangxi period?

If you mean people, that's not what people called them during the reign of Kangxi. At that time, the elders of the emperor generally called him "the emperor", and the courtiers of the emperor called him "the emperor", "your majesty" and "the holy one". If it is the third person, it can be called "Jin Shang". At that time, people would not directly use "Kangxi" to address people, which was disrespectful. Later generations, in the Qing Dynasty, the word "ye" should also be added to Kangxi. After entering the Republic of China, it was casual.