Lagunitas Brewing Company

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Dinah Eng, Top of the Hops; How Lagunitas Brewing Co came to be. Fortune, March 2018.
http://fortune.com/2018/02/25/la ... ft-beer-tony-magee/
("Lagunitas, now fully owned by Heineken International, had $228 million in annual revenue in 2016, and Magee remains as chairman of the board")

Note: Lagunitas Brewing Company (founded in 1993 at Lagunitas, but is now based in Petaluma -- both in California)  en.wikipedia.org.
(a)
(i) The unincorporated community of Lagunitas has
(A) City of Petaluma at 1 o'clock direction (20-mile air distance),
(B) and East Fork, Middle Fork and West Fork Lagunitas Creeks at the southeastern direction (6-mile air distance).
(i) Lagunitas Creek
https://en.wikipedia.org/wiki/Lagunitas_Creek
("The modern name, Lagunitas Creek, is derived from the several 'lagunitas' (Spanish for 'little lakes') which have now been turned into reservoirs by dams")

The creek is "a 24 miles (39 km)-long northward-flowing stream" flowing through a series of small lakes. First, "East Fork Lagunitas Creek," "Middle Fork Lagunitas Creek" and "West Fork Lagunitas Creek" -- the three empty separately into Lake Lagunitas. The Lagunitas Creek then flows through a series of lakes: Bon Tempe Lake, Alpine Lake. , Kent Lake (in that order) before the creek empties into Tomales Bay.  From Lake Lagunitas to Kent Lake (inclusive), the four forms the "little lakes" on which the unincorporated community bases its name. You may see these in the Google Maps, which may help you how the name Lagunitas came about.
(ii) "lagunitas is a diminutive of laguna": from the Web.
(iii) Spanish-English dictionary:
* laguna (noun feminine; from Latin lacūna): "lagoon; hole"
https://en.wiktionary.org/wiki/laguna
* lago (noun masculine; from Latin lacus): "lake"
https://en.wiktionary.org/wiki/lago

The Spanish noun lago is listed here for comparison, and to show that "lagunita" can not be a diminutive of "lago."  
(iv) Latin-English dictionary:
* lacuna (noun feminine; from Latin [noun masculine] lacus lake): "hole, pit"https://en.wiktionary.org/wiki/lacuna
(v) The suffix -ito/-ita (for masculine and feminine nouns respectively) creates diminutives in Spanish.

(b)
(i) Petaluma is the name of a river and an ancient Miwok village.
(ii) "The word Petaluma may derive from the Miwok [a Native American tribe and its language] words pe'ta, flat, and luma, back [meaning a flat area on the back of Sonoma Mountain]."  en.wikipedia.org for "Petaluma."