Yes, most were Lebanese Christians though, not Muslims. They are very prosperous - I think the richest man in the world is Mexican Carlos Slim and he is a Lebanese.
As the Ottoman empire was falling apart the Turks went crazy killing Christians. Los Turcos just meant they were form the Turkish empire not that they were actual ethnic Turks.
The Lebanese and Syrians I have known,whose forefathers came 2 generations ago,were all Christians.
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Yes, authorities in those countries called them Los Turcos because they entered on Turkish passports.