Tetragrammaton vs YHWH

Tetragrammaton

name
  • The four Hebrew letters יהוה (in transliteration, YHWH or JHVH) used as the ineffable name of God in the Hebrew Bible, variously transliterated as Yahweh or Jehovah. 

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 Tetragrammaton and YHWH occurred in a corpus of books? (source: Google Ngram Viewer )