Dhaka is also the name of capital of Bangladesh. It is named after Dhakeshwari i.e. the goddess of Dhakas. According to Dr Naval Viyogi [2] In a period of third century AD many hoards of Taka coins have been recovered from Nagpur region,[3] which were introduced by the Taka Nagas of North-West. Linguists have informed that these Taka people reached and ruled in the region of Dhaka of Bangla Desh, since the word ' Dhaka' is a linguistic (Pali) variation of Taka. [4] In the second act of Sanskrit play mrcchakatika a dialect has been used by author, known as Takki. Taki, Takka or Dhakka is the Prakrit dialect which has been called by Pischal language of East Bengal spoken around Dhaka, but there is another interpretation too, since word 'Ta' has been changed to 'Dha' due to the tendency of change from Sanskrit to Pali or Prakrit as cited above, hence the original word is Taka from which Dhaka has been derived.[5][6]
Dhaka is a name of Nagvanshi King( 2nd Stabdi to 5th stabdi).But,As per Max Mular his name is Dhata son of Dhatusena.Please read in this para " 'Certain members of the Moriyan dynasty, dreading the power of the (usurper) Subho, the bâlattho, had settled in various parts of the country, concealing themselves. Among them there was a certain landed proprietor Dhâtusena, who had established himself at Nandivâpi.His son named Dhâtâ, who lived at the village Ambiliyâgo, had two sons, Dhâtusena and Sîlatissabodhi, of unexceptional descent. Their mother's brother (Mahânâma), devoted to the cause of religion, continued to reside (at Anurâdhapura) in his sacerdotal character, at the edifice built by the minister Dîghasandana. The youth Dhâtusena became a priest in his fraternity, and on a certain day, while he was chaunting at the foot of a tree, a shower of rain fell, and a Nâga, seeing him there, encircled him in his folds, and covered him and his book with his hood. . . . Causing an image of Mahâ Mahinda to be made, and conveying it to the edifice (Ambamâlaka) in which the thera's body had been burnt, in order that be might celebrate a great festival there, and that he might also promulgate the contents of the Dîpavamsa,distributing a thousand pieces, he caused it to be read aloud [2]" and another side some history writers comments Dhaka is an Iranian word.It is changed from Azi-Dahaka "The original meaning of dahāka is uncertain. Among the meanings suggested are "stinging" (source uncertain), "burning" (cf. Sanskrit dahana), "man" or "manlike" (cf. Khotanese daha), "huge" or "foreign" (cf. the Scythian Dahae and the Vedic dasas). In Persian mythology, Dahāka is treated as a proper noun, and is the source of the Ḍaḥḥāk (Zahhāk) of the Shāhnāme. The Avestan term Aži Dahāka and the Middle Persian azdahāg are the source of the modern Persian and Urdu azhdahā (اژدها) as well as the Kurdish Hazhdiha (ههژدیها) which usually mean "dragon". Despite the negative aspect of Aži Dahāka in mythology, dragons have been used on some banners of war throughout the history of Iranian peoples. The Azhdarchid group of pterosaurs are named from an Persian word for "dragon" that ultimately comes from Aži Dahāka".
As per my knowledge Dhaka's are sattled in complete world with changing their title like:- Dhaka,Dhake,Deka,Dahaka,Dhoke and Dhakar etc.
Some of our another Gotra's where we cann't make marriage relations.
Kadak,Bardak,Badak and Bamel.These are known as our pad Gotra's.