Albert Barnes Commentary John 18:10-11

"Simon Peter therefore having a sword drew it, and struck the high priest`s servant, and cut off his right ear. Now the servant`s name was Malchus. Jesus therefore said unto Peter, Put up the sword into the sheath: the cup which the Father hath given me, shall I not drink it?" — John 18:10-11 (ASV)

The servant's name was Malchus. His name is mentioned by neither of the other evangelists, nor is it said by the other evangelists who was the disciple that gave the blow. It is probable that both Peter and the servant were alive when the other gospels were written.