Jehovah vs YHWH

Jehovah

name

  • The personal name of God in the Hebrew Scriptures; in Hebrew, יהוה (YHVH) 

noun

  • A Jehovah's Witness. 

YHWH

name

  • Known as the "Tetragrammaton", the four Hebrew letters יהוה which are transliterated into the Latin alphabet as YHWH (or IHVH, JHVH, or YHVH). Usually vowels are added to produce the spelling Jehovah, Yehovah or Yahweh (Jahaveh, Jahve, Jahveh, Jahweh, Yahve, Yahveh, Yahwe). 

How often have the words Jehovah and YHWH occurred in a corpus of books? (source: Google Ngram Viewer )