An entry in the New Haven Vital Records transcript reads:
Sam'll Son of S'd. Beecher was born Nov'r: 15 1750
(note: I've used an apostrophe to indicate that the next letter/s are superscripted as an abbreviation.)
If you have a subscription to AmericanAncestors:
New Haven, CT: Vital Records, 1649-1850.(Online database: AmericanAncestors.org.New England Historic Genealogical Society, 2007), (Vital Records of New Haven, 1649-1850, Connecticut Society of the Order of the Founders and Patriots of America, Hartford, CT, 1917.), vol. 1, p. 353.
Hezekiah Beecher, b. 29 Jul 1755, also shows up as a son of this Sd. Beecher (the second line below Sam'll), yet his profile here on WikiTree says that his father is Isaac, following Jacobus, Families of Ancient New Haven, vol. 1, p. 170.
Is "Sd." actually an abbreviation for "Isaac" ? It doesn't seem to be used as such elsewhere in this part of the transcript.