Slim,
You can follow that chain yourself. Franz wasn't the ghostwriter for Rutherford. JFR's legalese marked a distinctive writing style. Though the name Jehovah is used in the Russell era, Russell himself almost always used Lord or God.
Starting with the first edition of Harp of God [Not the revised edition of 1928] Rutherford emphasized God's name. A searchable edition is online somewhere. But any pdf will do. Go to page 12 starting with the subheading "Who is God." Rutherford emphasized the name Jehovah: Starting with page 14, he identifies God as Jehovah, his distinctive name. Though one can find "Jehovah" in Watch Tower articles between 1917 and 1921, this marked the start of its regular use in articles we can identify as Rutherford's through his legalistic style. ('to wit' and similar usages.) This is true of Rutherford's books as well. You can trace it book by book. And in the booklet Who is God? Also, note the 1934 book "Jehovah."
I suspect, but cannot prove, that Rutherford was influenced by the American Standard Version Bible.
The adoption of the name "Jehovah's witnesses" (no capital on the W until much later) was prompted by Rutherford's insistence on using the name. And the resolution adopting the 'new name' is in Rutherford's style.
I don't want to emulate our neighborhood Catholic troll and write an essay, and this is hijacking this thread.. I'll leave the rest to your personal research.