Personal names may depend generally on the person's religion and also have origins from other languages like Arabic, Persian, Sanskrit and Pali, but they are used and pronounced as according to the native Bengali language.
Though middle names are very common in Bangladesh, not every individual has one; this applies to West Bengal as well.
Recently, many people have begun to add their dak nam to the middle or end of their full official name, resulting in names like "Saifuddin Kanchon Choudhuri" (সাইফুদ্দীন কাঞ্চন চৌধুরী), where "Saifuddin" would be the man's bhalo nam, "Kanchon" would be his dak nam and "Choudhuri" would be his family name.
Some of their names are somewhat shortened and altered, like Chatterjee, owing to British influence.
Some family names may be common between all religions, such as চৌধুরী (Choudhuri / Chowdhury), সরকার (Sorkar / Sarker / Sarkar) and বিশ্বাস (Bishwas).
Most Catholic Bengali Christians have Portuguese surname, such as: Gomes, Rozario, D'Costa, Gonsalvez, Cruze, Dias, D'Silva and D'Souza.