Around 1150 Dacian anthroponyms and 900 toponyms have been preserved in ancient sources. As far as the onomastic of Dacians and Thracians is concerned, opinions are divided. According to Crossland (1982), the evidence of names from the Dacian, Mysian and Thracian area seems to indicate divergence of a 'Thraco-Dacian' language into northern and southern groups of dialects, but not so different as to rank Thracian and Dacian as separate languages, There were also the development of special tendencies in word formation and of certain secondary phonetic features in each group. Mateescu (1923), Rosetti (1978) sustain that Thracian onomastic include elements that are common to Geto-Dacians and Bessians (a Thracian tribe). A part of researchers support that onomastically, Dacians are not different from the other Thracians in Roman Dacia’s inscriptions. But recently, D. Dana basing himself on new onomastic material recorded in Egyptian ostraka suggested criteria which would make possible to distinguish between closely related Thracian and Dacian-Moesian names and singled out certain specific elements for the latter.
In Georgiev’s opinion (1960; 1977) Dacian placenames and personal names are "completely different" from their Thracian counterparts.
Several Dacian names have also been identified with ostracons of Dacian cavalry recruited after the Roman conquest and stationed in East Egypt, i.e. Dadas and Dadazi, Zoutoula, Dotos and Dotouzi, Dieri and Diernais, Diengis, Dida(s), Blaikisa, Blegissa, Diourdanos, Thiadicem, Avizina, Dourpokis, Kaigiza, Dardiolai, Denzibalos (see also Dacian king name Deki-balos), Denzi-balus (attested in Britain), Pouridour, Thiaper and Tiatitis, Dekinais, *Rolouzis, (See Ostraca from Krokodilo and Didymoi)
Tomaschek compared this name with the name Cotela of a Getian prince
and with the name Cotys, name of several princes of Thracian Odrysians and Sapaeans. Also, he compared with the name Kotys of the Thracian goddess worshipped by the Edonians, a tribe that lived around Pangaion Mountain. He sees here again, the letter "o" as an obscured indistinct, pronunciation of “a”. Therefore, he compared Cotiso with the BactrianKata "loved" 
a) According to Russu 'Flow' / 'moisture' It has probably the same root with Napoca (Nowadays Cluj-Napoca) 
b) According to Parvan, after Tomaschek the meaning is similar with Lith. Napras in which there is a high probability of the root nebh-“to spring”.  c) According to Bogrea, 'spring' compared with Old Persian napas ‘spring’ 
^"De Imperatoribus Romanis"(Assorted Imperial Battle Descriptions). An Online Encyclopedia of Roman Emperors. Retrieved 2007-11-08. Battle of Sarmizegetusa (Sarmizegetuza), A.D. 105. During Trajan"s reign one of the most important Roman successes was the victory over the Dacians. The first important confrontation between the Romans and the Dacians took place in the year 87 and was initiated by Domitian. The praetorian prefectCornelius led five or six legions across the Danube on a bridge of ships and advanced towards Banat (in Romania). The Romans were surprised by a Dacian attack at Tapae (near the village of Bucova, in Romania). Legion V Alaude was crushed and Cornelius Fuscus was killed. The victorious general was originally known as Diurpaneus (see Manea, p.109), but after this victory he was called Decebalus (the brave one).
Dumistracel, Stelian (1988). "Numele traco-dacice de tipul Muca-, Moca- raportate la cuvintele romanesti de substrat Muc si Mugurel". Anuarul Institutului de Istorie și Arheologie "A.D. Xenopol.", Volume 25, Issue 1 (in Romanian). Bucharest: Editura Academiei.
Nandris, John; Friesinger, Herwig; Kerchler, Helga; Pittioni, Richard; Mitscha-Märheim, Herbert (1976). The Dacian Iron Age A Comment in a European Context in Festschrift für Richard Pittioni zum siebzigsten Geburtstag. Wien : Deuticke ; Horn : Berger. ISBN978-3-7005-4420-3.
Oltean, I.A. (2009). "Dacian ethnic identity and the Roman army". The army and frontiers of Rome: papers offered to David J. Breeze on the occasion of his sixty-fifth birthday and his retirement from Historic Scotland edited by William S. Hanson. Journal of Roman Archaeology. ISBN978-1-887829-74-8.line feed character in |title= at position 32 (help)
Pârvan, Vasile, ed. (1982). Getica (in Romanian). Bucharest: Meridiane.
Parvan, Vasile (1926). Getica. Cvltvra naţională, Bucvreşti.
Paliga, Sorinn, ed. (1982). "Etymological Lexicon of the Indigenous (Thracian) Elements in Romanian" / "Lexicon etimologic al elementelor autohtone (traco-dace) ale limbii române (in Romanian). Bucharest: Evenimentul.
Petrescu-Dîmbovița, Mircea (1978). 'Scurta istorie a daciei Preromane'. Junimea.