And, yes, "hound of X" becomes a fairly common type of name in the 7th century and later. The implication for Cú Chulainn being that his name cannot go back any further than the 7th century. For what it is worth, even the birth name of Cú Chulainn, i.e. Setantae or Sétantae (we don't know...
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Unfortunately, M. O'Brien doesn't say much at all.
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First, the only attestation of "setan" (in two copies) is so isolated that we cannot be sure that it is a genuine word of Irish at all.
Second, there is no productive adjectival suffix -ta in OIr. You are probably thinking of the morpheme of the...
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Or from St- and borrowed after int was reduced to S- only?