Believers call on the name of who?

After that he planted a tamarisk tree at Beʹer-sheʹba, and there he called on the name of Jehovah, the everlasting God.

Jehovah is near to all those calling on him, To all who call on him in truth.

Moses and Aaron were among his priests,
And Samuel was among those calling on his name.
They would call to Jehovah,
And he would answer them.
He would speak to them from the pillar of cloud.
They kept his reminders and the decree that he gave to them.

I love Jehovah
Because he hears my voice, my pleas for help.
For he inclines his ear to me,
And I will call on him as long as I live.
The ropes of death encircled me;
The Grave had me in its grip.
I was overcome by distress and grief.
But I called on the name of Jehovah:
“O Jehovah, rescue me!”

And everyone who calls on the name of Jehovah will be saved; For on Mount Zion and in Jerusalem there will be those who escape, just as Jehovah has said, The survivors whom Jehovah calls.

I will offer to you the sacrifice of thanksgiving
And call on the name of Jehovah.

To the congregation of God that is in Corinth, to you who have been sanctified in union with Christ Jesus, called to be holy ones, together with all those everywhere who are calling on the name of our Lord Jesus Christ, their Lord and ours: