Yahuah is the actual Name in the Old Testament written in Hebrew. Isa 42:8  I am Yahuah: that is my name: and my glory will I not give to another, neither my praise to graven images. Exo 3:14  And Elohiym said unto El־Mosheh, Ehayah Asher Ehayah: and he said, Thus shall you say unto the children of Yashar’el, Ehayah has sent me unto you. 
Exo 3:15  And Elohiym said moreover unto El־Mosheh, Thus shall you say unto the children of Yashar’el, Yahuah Elohai of your fathers, the Elohai of Avraham, the Elohai of Yitschaq, and the Elohai of Ya`aqov, has sent me unto you: this is my name forever, and this is my mention unto all generations.