When Moshe approached Pharaoh for the first time

Exodus Chapter 5:1-2 שְׁמוֹת

1 And afterward Moses and Aaron came, and said to Pharaoh: ‘The LORD, the God of Israel said: Let My people go, that they may hold a feast unto Me in the wilderness.’

ב  וַיֹּאמֶר פַּרְעֹה–מִי יְהוָה אֲשֶׁר אֶשְׁמַע בְּקֹלוֹ, לְשַׁלַּח אֶת-יִשְׂרָאֵל:  לֹא יָדַעְתִּי אֶת-יְהוָה, וְגַם אֶת-יִשְׂרָאֵל לֹא אֲשַׁלֵּחַ

2 And Pharaoh said: ‘Who is the LORD, that I should listen to him and let Israel go? I don’t know your LORD, I never heard of Him and moreover I will not let Israel go.’

How is it that Pharaoh did not know Hashem?

כֹּה-אָמַר יְהוָה, אֱלֹהֵי יִשְׂרָאֵל – ‘The LORD, the God of Israel said

Yosef introduces Hashem first to Pharoah – Genesis Chapter 41:16-38-39 בְּרֵאשִׁית

טז  וַיַּעַן יוֹסֵף אֶת-פַּרְעֹה לֵאמֹר, בִּלְעָדָי:  אֱלֹהִים, יַעֲנֶה אֶת-שְׁלוֹם פַּרְעֹה.

16 And Joseph answered and said to Pharaoh, ‘It is not in me; God will give Pharaoh an answer of peace.’

לח  וַיֹּאמֶר פַּרְעֹה, אֶל-עֲבָדָיו:  הֲנִמְצָא כָזֶה–אִישׁ, אֲשֶׁר רוּחַ אֱלֹהִים בּוֹ.

38 And Pharaoh said to his servants: ‘Can we find such a man in whom the spirit of God is?’

לט  וַיֹּאמֶר פַּרְעֹה אֶל-יוֹסֵף, אַחֲרֵי הוֹדִיעַ אֱלֹהִים אוֹתְךָ אֶת-כָּל-זֹאת, אֵין-נָבוֹן וְחָכָם, כָּמוֹךָ.

39 And Pharaoh said to Joseph: ‘Forasmuch as God had shown you all this, there is none so discreet and wise as you.

SINCE PHARAOH NOW REJECTED GOD WHO CREATED THE WHOLE ENTIRE WORLD IN 10 STATEMENTS, AND IN SIX DAYS, GOD THERFORE SENT FORTH 10 PLEAGUES TO SHOW THE ENTIRE WORLD THAT HE IS THE GOD OF UNIVERSE AND HE CONTROLS NATURE AND EVERYTHING IN IT.

NOTE: PHAROAH REALLY DIDNT KNOW יְהוָה BUT HE KNOW OF אֱלֹהִים

Exodus Chapter 6:2- VA’Eira

ב  וַיְדַבֵּר אֱלֹהִים, אֶל-מֹשֶׁה; וַיֹּאמֶר אֵלָיו, אֲנִי יְהוָה.

2 And God spoke to Moses, and said to him: ‘I am the LORD;

ג  וָאֵרָא, אֶל-אַבְרָהָם אֶל-יִצְחָק וְאֶל-יַעֲקֹב–בְּאֵל שַׁדָּי; וּשְׁמִי יְהוָה, לֹא נוֹדַעְתִּי לָהֶם

3 and I appeared to Abraham, to Isaac, and to Jacob, as God Almighty, (אֱלֹהִים) but

by My name YHWHI/ יְהוָה I never made it known to them.