MaxInDHouse:

You missed it again!
How many times do i have to teach you what a founder means?
Jesus is the one whose teachings increases the understanding of a group from time to time, if Russell do celebrate Christmas in his life time how could he be the founder of a group that's now seeing Christmas as Idolatry? Other religions claiming Christians around you have remained in the things humans laid down for them till now, instead of accepting correction a set will just separate themselves from a group and start another group saying the Holy Spirit has revealed something to them, but at the same time they will continue to count those who ignore the things they claim holy spirit revealed to them as worshipers of the same God in the name of "DENOMINATIONS"
Well that's how they keep on creating more lanes for the broad road! Matthew 7:13-14
So my young man, Jesus is the founder whose teachings always increase the understanding of a group from time to time and instantly they will all yield to the new light {Proverbs 4:18} because they believe what Jesus told them. John 16:12-13

So how did Jesus found Jehovah witness?

And how many of the disciples were Jehovah witnesses?

AntiChristian:

So how did Jesus found Jehovah witness?

Worshipers of God practicing pure worship as a group have been called different names in the past:
Abraham's offspring, Israelites, Jews, Christians but none of this group names is what God want His true worshipers to be called as a group. He (God) first mentioned it some 2,600 years ago saying:

"You are my WITNESSES " Isaiah 43:10-12

Then He said Satan's human agents that will be destroyed will also like to bear the same group name with His worshipers during the endtime but then He (God) will start calling His own worshipers by another group name:

"You will leave behind a name that my chosen ones will use as a curse, And the Sovereign Lord Jehovah will put each of you to death, But his own servants he will call by another name" Isaiah 65:15

The above prophecy was fulfilled in 1931!
Jesus returned in 1914 as a mighty spirit king and began correcting the one and only group that's willing to accept correction back then, this group is popularly known as International Bible Students Association for over 60 years of their establishment. After Jesus has been correcting them and they are fast making amendments (though all other religious groups were mocking them) Jehovah used His Holy Spirit to declare what He promised through Isaiah, and instantly they began bearing the group name JEHOVAH'S WITNESSES! And ever since then the difference between them and other groups claiming Christians has been getting clearer! Matthew 5:13-16

AntiChristian:

And how many of the disciples were Jehovah witnesses?

Jehovah hid that name from the eyes of pagans claiming worshipers of God.
Whereas that's what He had in mind to call people like Abel, Enoch, Noah, Abraham, Isaac, Jacob, Joseph, Moses, Joshua, Rahab, David, Elijah and all ancient prophets before Jesus {Hebrews 11:4-32; 12:1} but had it been that the first century followers of Christ began using this name all these pagans claiming denominations in Christianity today would have declared themselves JEHOVAH'S WITNESSES. That's why He hid it until 1931!