🔼The name Zaccai in the Bible
There's probably only one man named Zaccai in the Bible, although it seems plausible that the name Zaccheus is the Hellenized version of this name. Both Ezra and Nehemiah mention him as the patriarch of 760 regular people (not priests) who returned from the Babylonian exile (Ezra 2:9, Nehemiah 7:14).
The Masoretes believed that the Zabbai mentioned in Nehemiah 3:20 wasn't really called Zabbai but rather Zaccai, but of the modern English translations only the JSP follows that suggestion. The rest of the versions read Zabbai here.
🔼Etymology of the name Zaccai
There is some controversy concerning the origin of the name Zaccai. The scholars who compiled the NOBSE Study Bible Name List believe that Zaccai is short for Zechariah, which consists of יה (yah), which in turn is short for יהוה, or YHWH, and an expression of the verb זכר (zakar), meaning to remember:
Other scholars think that our name was derived from the verb זכך (zakak), meaning to be pure:
The letter י (yod) upon which our name ends, may either create an adjective (purely), a possessive form (my purity), or may be a remnant of יה (Yah), which is short for יהוה, or YHWH.
For a meaning of the name Zaccai, NOBSE Study Bible Name List reports that Zaccai is "probably a contraction of Zechariah" for which it reads Yahweh Remembers.
Jones' Dictionary of Old Testament Proper Names goes with the verb זכך (zakak) and takes the final י (yod) to be short for YHWH and proposes Pure Of The Lord.
BDB Theological Dictionary doesn't translate our name but does list it under the verb זכך (zakak).