Bungalow: shared roots, separate routes
The word bungalow reaches English from Indian languages, and the sources agree on that broad direction while differing in the exact route and dating. Merriam-Webster's entry gives Hindi baṅglā and Urdu banglā, with the literal sense “(house) in the Bengal style,” and records a first-known use of 1676 in the meaning defined. The American Heritage Dictionary prints the etymology “[Hindi baṅglā, Bengali, bungalow.]” without a date; under the dictionary's own etymology key the words after the source form are the entry's gloss, so the cited source is Hindi baṅglā, not a separate Bengali stage. The Online Etymology Dictionary gives a route of Gujarati bangalo from Hindi bangla and dates the English/Anglo-Indian term to the 1670s, but it is a secondary compilation rather than a primary dated quotation. Modern dictionary senses include a one-story house; Merriam-Webster also gives a low-pitched roof, and the American Heritage Dictionary describes veranda and eaves. None of these sources establishes a date, place, or person for any architectural evolution, and none supports calling 1676 the exact origin or treating the word as a coinage.
This page summarizes the cited sources. Follow each source for its full wording, notes and references.