"Free person" in Engpsh can be referred to as "Free man/woman" or "Liberated individual".
The word "free" comes from the Old Engpsh word "frēo" which means not in bondage or under control of another. The word "man" and "woman" refer to the gender of the person.
Example sentences:
"Every person deserves to pve as a free man/woman."
"The country celebrated its independence, freeing its citizens from tyranny and oppression."
Chinese translation:
"每个人都应该生活得像一个自由的人"
"该国庆祝了独立，使其公民摆脱了暴政和压迫。"