Anderson's Great Migration Begins p. 643 for Zerubbabel Endicott says "m. (1) about 1654 Mary [Smith]" and I can't find what the brackets mean, but I wonder if they're derived from...
Torrey's Marriages p. 252 says "1/wf Mary [SMITH] (1636-20 Jun 1677); ca 1654; Salem"; the Third Supplement of Torrey's p. 91 has it as "1/wf Mary SMITH?; m c1654 Salem [GMB 1:643]" so now we've come full circle. According to the intro to Torrey's on p. xiv, "a surname in brackets is one not derived from a marriage record".
NEHGR 1:335 calls her "Mary ___".
Mary, the daughter of Samuel Smith of Salem and Wenham, was called only "Mare" in her father's will in 1642; provisions made for her indicate she was a minor and unmarried (see Essex Probates vol. 1 pp. 18-21 at 19-20). Samuel Smith was a 1636 arrival so there isn't a full profile in Great Migration yet. Threlfall's 50 Great Migration Colonists profile of Samuel doesn't give any marriage for Mary Smith (p. 382, I have the book).
The only place I've found where Zerubbabel's wife and her parents are named — as "Mary Smith, dau. of Samuel and Sarah Smith of Great Yarmouth, Eng." — is McCloskey's Some Descendants of John Endicott, 1881 1943, p. 28. Shockingly (by which I mean not at all surprisingly), the author asserts this without citing a source (and is wrong about Samuel's origin, which per Anderson is unknown).
Zerubbabel is the only one of Governor John Endicott's sons who left descendants, and Mary is thought to be the mother of all his children, so the identification is notable-adjacent, I guess. :)
Any idea what evidence there might be for her name and parentage?
Editing to add: thanks commenters below who point out that first, I have the date totally wrong for McCloskey (corrected above); second, she was clearly summarizing an earlier work, W.C. Endicott's Memoir of Samuel Endicott, 1924, pp. 76-7: "Married, 1st, about 1654, Wenham, Mary Smith, daughter of Samuel Smith and Sarah his wife, of Great Yarmouth, Norfolk, England; born 1636, Wenham; died June 20, 1677, Salem. Place of burial — Endicott Burying Ground, Danvers." No sources cited for any of that; I looked at the other sources cited later in the Notes section and none of them have those details.
His Note about Mary's admission to First Church in 1666 is not sourced either, but I found published records of First Church and I think he's referencing this one on p. 109. Two related records on pp. 27 and 28 make it clear they all refer to our Mary, wife of Zerubbabel, but nothing in those records connects to Smith.