John Gill Commentary 1 Chronicles 9:11

"and Azariah the son of Hilkiah, the son of Meshullam, the son of Zadok, the son of Meraioth, the son of Ahitub, the ruler of the house of God;" — 1 Chronicles 9:11 (ASV)

And Azariah the son of Hilkiah
That is, the son of Azariah, whose name was Seraiah, see (1 Chronicles 6:13 1 Chronicles 6:14) (Nehemiah 11:11) , whose pedigree is traced up from Hilkiah through Meshullam, called Shallum, (1 Chronicles 6:12 1 Chronicles 6:13) . Zadok, Meraioth, to Ahitub,

the ruler of the house of God ;
high priest in it; which is to be understood of Ahitub, and not of Azariah or Seraiah in the time of Ezra; for Joshua was then high priest.