Thank you for the link, and thanks to all those who took time to email me.

I do not know Daniel Somers (Summers) Lacy's city of birth or his parents' names; that is what I'm trying to find out.
I could not find him in the Hartford records.

However, family names mimic those of the Fairfield Lacys, and most of those were from Stratfield or Stratford.

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(posting this just in case...)
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I tried searching in reverse order, attempting to find all descendants of Edward Lacy and Hannah Summers, but hit a dead end at their grandchildren.

Possible siblings include Charles Lacy, Russell Lacy, William H. Lacy, John Lacy. These 4 are born approximately at the same time as Daniel, in CT, with both parents born in CT (source: 1880 census).
In addition, the names John, Daniel, Somers, Charles, Russell, Mark repeat throughout our line.

Another possibility is the family of Thomas Lacey, who married Mary Russell. Her family is from Somers, CT.

If anyone stumbles upon this information, please remember me!!!