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In page Names of God in Judaism:

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One of the most important names is that of the Ein Sof (אין סוף "Endless"), which first came into use after 1300 CE.[1] Another name is derived from the names אהיה יהוה אדוני הויה. By spelling these four names out with the names of the Hebrew letters (אלף, הא, וו, יוד, דלת and נון) this new forty-five letter long name is produced. Spelling the letters in יהוה (YHWH) by itself gives יוד הא ואו הא. Each letter in Hebrew is given a value, according to gematria, and the value of יוד הא ואו הא is also 45.[citation needed]