I`m not answering this question , I`m asking it for the sole purpose of obtaining other peoples viewpoint .
For 33 years I was a true believer in the Bible , or so I thought ,.I am now enlightened .
No , I don`t think a Catholic monk of the 13th Century came up with those names you mention.
And in some translations
those names Jehoshua and Jehoshaphat start with a Y and not a J , as did Yesus
instead of Jesus ,Hebrew not having a "J" sound .
No scriptures ,Hebrew , Aramaic , or Greek ever had the name Jehovah in them , his name was more accurately translated only by the four letters YHWH , the tetragramaton ., which by the way is not found in the Christian Greek Scriptures ,according to the WTB&TS ,"Kingdom Interlinear" translation.
That is my understanding ,by all means correct me if I am wrong .
Jehovah`s witnesses , consider singing the National anthem of a Country ,Pledging allegiance to a Country , Saluting a flag of a Country ,all to be an act of worship.
And apparently bending the Knee to Jesus is also an act of worship which now they refuse to do , yet the scriptures say is O.K.