What is God's real first name?

Can you elaborate on the concept of God having a "real first name"? In most religious and spiritual traditions, God is often viewed as a transcendent being beyond human comprehension and language, making the notion of assigning a specific first name to God somewhat controversial. Are you referring to a particular religious or philosophical tradition that ascribes a first name to God? If so, which one? Additionally, what is the significance of knowing God's first name, and how does it impact one's understanding of God or their relationship with the divine?