Adam Clarke on Leviticus 24:16

Blasphemeth the name of the Lord - ונקב שם יהוה venokeb shem Yehovah, he who pierces, transfixes, or, as some translate it, expounds, the name of Jehovah; see the note on Lev 24:10. This being the name by which especially the Divine Essence was pointed out, it should be held peculiarly sacred. We have already seen that the Jews never pronounce this name, and so long has it been disused among them that the true pronunciation is now totally lost; See on the word Jehovah, Exo 6:3 (note).