The person who gave oxygen its name is Antoine Lavoisier
In 1772, Carl Wilhelm Scheele, a Swedish chemist, discovered oxygen but did not publish his finding immediately.
In 1774, Joseph Priestly, an English chemist, discovered it and published his findings in the same year, before Scheele did.
In 1775, Antoine Lavoisier, a French chemist, discovered that this new gas supported combustion and formed about one-fifth of the volume of air. He gave it the name oxygen.
Therefore, The person who gave oxygen its name is Antoine Lavoisier.