There has only been one pope by that name - Pope Benedict XVI.
There have been no popes named Kenneth.
There have been 6 popes named Sixtus.
There have been 13 popes named Leo.
There have been 13 popes named Innocent.
There have been no popes named Jude.
There have been 16 popes named Gregory. Gregory XVI reigned from 1831 to 1846.
There have been 8 popes called Urban.
There have been 6 popes who chose the name of Paul.
23
There have been 23 popes named John, Pope John XXIII was the last. He died in 1963.
There has never been a Pope Augustus.