Elisheva (אֱלִישֶׁבַע) combines El (God) and sheva (oath, seven, fullness). The meaning is "God is my oath" or "My God is fullness." In the OT it is the name of Aaron's wife (Exodus 6:23). The Greek equivalent Elisabet (Ἐλισάβετ) is the name of John the Baptist's mother in the NT.
The name Elisheva/Elizabeth appears at two pivotal redemptive-historical moments: the institution of the Aaronic priesthood (Aaron's wife), and the dawn of the New Covenant (John the Baptist's mother). Elizabeth was filled with the Holy Spirit and uttered the first recorded Spirit-inspired NT prophecy (Luke 1:41–45), declaring Mary "blessed among women." The name signals God's faithfulness to covenant oath — El is sheva, God is the One who swears and keeps His promises.