Meraioth
Meraioth is a name carried by priests in the Aaronic line. The Old Testament uses it twice: first for an early high priest descended from Eleazar whose name becomes a fixed waypoint in later genealogies, and second for the head of a priestly house in the days of Joiakim after the return from exile.
A High Priest in the Line of Eleazar
The Chronicler places Meraioth in the descending genealogy that runs from Aaron through Eleazar. Uzzi and Zerahiah stand directly above him, and Amariah and Ahitub follow: "and Uzzi begot Zerahiah, and Zerahiah begot Meraioth" (1Ch 6:6); "Meraioth begot Amariah, and Amariah begot Ahitub" (1Ch 6:7). The same sequence is reused in the list of those who served at the Levitical cities, again locking Meraioth between Zerahiah above and Amariah and Ahitub below: "Meraioth his son, Amariah his son, Ahitub his son" (1Ch 6:52).
Ezra's own pedigree, which traces his priestly authority back to Aaron, threads through the same name on its way upward: "the son of Amariah, the son of Azariah, the son of Meraioth" (Ezr 7:3). The line is cited not for its own sake but as the warrant for Ezra's standing as a priest.
Meraioth, Son of Ahitub: The Post-Exilic Register
By the time of the post-exilic priestly registers, the formula "son of Zadok, son of Meraioth, son of Ahitub" has become a compact way of identifying the senior Jerusalem priestly household. The Chronicler attaches it to Azariah at the head of the temple establishment: "and Azariah the son of Hilkiah, the son of Meshullam, the son of Zadok, the son of Meraioth, the son of Ahitub, the leader of the house of God" (1Ch 9:11). Nehemiah's parallel notice attaches the same chain to Seraiah, again with Meraioth set between Zadok and Ahitub: "Seraiah the son of Hilkiah, the son of Meshullam, the son of Zadok, the son of Meraioth, the son of Ahitub, the leader of the house of God" (Ne 11:11). In both registers Meraioth is named not as a contemporary figure but as a fixed point in the ancestry by which the chief priestly officer of the temple is identified.
A Priest in the Days of Joiakim
A second Meraioth appears as the head of a priestly house in the generation after the return, when Joiakim was high priest. He is listed among the houses whose representatives served in his day: "of Harim, Adna; of Meraioth, Helkai" (Ne 12:15). Here Meraioth is the name of the house and Helkai its current head, marking the name's continuation in the post-exilic priesthood beyond its earlier high-priestly bearer.