The usual form of the ancient West Semitic (Hebrew) יהוה used in scholarship.
Used especially in discussions of the religion of the ancient kingdoms of Israel and Judah.
The spelling Jahweh was used in German since the 1850s. The spelling Yahweh in English (ensuring the pronunciation of the initial consonant as /j/) first appears in the 1860s, e.g. in the Herald of the Kingdom and Age to Come edited by John Thomas, founder of the Antipas Christadelphians (vol. X. no. 1, Westchester, NY, January 1860). First appeared in English Bible translations for the Tetragrammaton in the 1902 Emphasized Bible (EBR).
We are too much men and women; we are yet formed in the image of the Creator, and what can we say of Him with any certainty except that He, whoever He may be—Christ, Yahweh, Allah—He made us, did He not, because even He in His Infinite Perfection could not bear to be alone.