"Jehovah" is a transliteration of the Tetragrammaton (YHWH), which is the four-letter biblical name of God in Hebrew scripture. The name is used mainly in the context of the Judeo-Christian tradition and is particularly associated with the personal name of God in the Hebrew Bible (Tanakh).
The use of "Jehovah" originated in the Middle Ages when scholars attempted to vocalize the Tetragrammaton using Latin vowels, leading to the construction of "Jehovah." In many Christian circles, this name is significant, as it expresses the personal nature of God and His covenant relationship with humanity.
In Judaism, the name of God is considered sacred and is often not pronounced as written. Instead, it is replaced with terms like "Adonai" (Lord) or "HaShem" (The Name) in prayer and discussion.
Different religious groups, including Jehovah's Witnesses, specifically emphasize the use of "Jehovah" in their beliefs and teachings about God's nature and identity.