Not so long – it was originally Pitt’s Borough, like many English towns, and as is maintained in New York City when the rest of the state went to townships. It was shortened in writing to Pittsburgh, and the when the Germans came they used their version of borough, burg [obviously the same root language].
They wanted to hang on to their “H” as a reminder of their English, rather than German origin.
Or so I’ve been told by a few natives, and it holds up to so search.
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