I study genetics and the arab dna is in very limited amounts in south asia. its mostly found in balochistan and sindh. Most of the these sheikhs are converted people from hinduism. the only people in south asia who may have more arab dna are Shias, because their famlies might be directly related to the syed's who came from karbala, but even they have probably mixed a lot with local people
If you are pakistani, i must say pakistanis are really a hybrid people. basically pakistanis are a mix of ancestoral south indians(dravdians), ancestoral north indians (who are caucasians) and little components of middle eastern dna