They were called Jehovah because, for all practical terms, people thought they were speaking with Jehovah.
Jehovah can't be seen or heard or touched.
But when you see, hear and touch a Messenger from Jehovah, you can say "I saw, heard and touched Jehovah".
That is what a Manifestation of God is about.
Sorry scripture calls the Messenger and the word Jehovah
The messenger calls himself the God of Abraham, Isaac, and Jacob
Exodus 23:20–21 (LEB) — 20 “ ‘Look, I am about to send an angel before you to guard you on the way and to bring you to the place that I have prepared. 21 Be attentive to him and listen to his voice; do not rebel against him, because he will not forgive your transgression, for my name is in him.
Jehovah himself says his name is in
He is called the God of Abraham, Isaac and Jacob and scripture calls him Yahweh (Jehovah)
Exodus 3:2–6 (LEB) — 2 And the
angel of Yahweh appeared to him in a flame of fire from the midst of a bush, and he looked, and there was the bush burning with fire, but the bush was not being consumed. 3 And Moses said, “Let me turn aside and see this great sight. Why does the bush not burn up?” 4 And
Yahweh saw that he turned aside to see, and
God called to him from the midst of the bush, and he said, “Moses, Moses.” And he said, “Here I am.” 5 And he said, “You must not come near to here. Take off your sandals from on your feet, because the place on which you are standing, it is holy ground.” 6 And he said, “
I am the God of your father, the God of Abraham, the God of Isaac, and the God of Jacob.” And Moses hid his face because he was afraid of looking at God.
Exodus 3:2–7 (UASV) — 2 The
angel of Jehovah appeared to him in a blazing fire from the midst of a bush; and he looked, and behold, the bush was burning with fire, yet the bush was not consumed. 3 And Moses said, “Let me turn aside to see this great sight, why the bush is not burned.” 4 When Jehovah saw that he turned aside to see,
God called to him out of the bush, “Moses, Moses!” And he said, “Here I am.” 5 Then he said, “Do not come near; take your sandals off your feet, for the place on which you are standing is holy ground.” 6 And he said,
“I am the God of your father, the God of Abraham, the God of Isaac, and the God of Jacob.”
And Moses hid his face, for he was afraid to look at God. 7 And
Jehovah said, I have surely seen the affliction of my people that are in Egypt, and have heard their cry because of their taskmasters, for I know their sufferings.