In fact, the association with κρήνη is suggested by Etymologicum Magnum, which states that κρήνικος and γρήνικος derive from κρήνη. The dictionary offers other possibilities, as well, which could be described as folk etymologies. It is impossible to say to what extent the idea that κρηνικός and γρηνικός are the same word is based on earlier testimonies or whether it occurred to the lexicographer on the basis of their phonetic similarity. The change in stress can be explained by the conversion of the common noun into a proper one, which is a frequent phenomenon. The problem with vocalism is also reminiscent of the situation with the ancient Greek κρήνη < *κράσνα, where various explanations are sought for -ρη- instead of -ρα-. There have also been suggestions that κρήνη is a loanword in ancient Greek. The name has no onomastic parallels in Thrace, but neither does it have any in Asia Minor. Since there are other Thracian hydronyms in the Troad (e.g. the left tributary of the Granicus is the Rhesus), the debate as to whether the name could be Thracian remains open.