*Outigirn is a name that appears in HG 10. But in JC 5 his name has been corrupted to *Kyndeern weldic.
A later individual with the same name is to be found in HB 62:
Then Dutgirn at that time fought bravely against the nation of the Angles. At that time, Talhaiarn Cataguen was famed for poetry, and Neirin, and Taliesin and Bluchbard, and Cian, who is called Guenith Guaut, were all famous at the same time in British poetry.
The document indicates that *Dutgirn or *Outigirn (Eudeyrn) lived in the time of Ida and Maelgwn. The corruption of the name Eudeyrn to Cyndeyrn that occurred in JC 5 may have occurred in the opposite direction, i.e. Cyndeyrn to Eudeyrn in the HB. Chronology suggests the HB reference is to Cyndeyrn Fendigaid ab Owain ap Cyngar who appears in ABT 18a and JC 13. He was not Cyndeyrn Garthwys ab Owain ab Urien Rheged of ByS 14.
Orthodox wisdom states Coel Hen was the son of Tegfan. However, I believe he was the son of Godebog m. Tegfan. My evidence for this claim is that the earliest documents say so, namely HG 10 and JC 5. It is in later documents that one sees the name Coel Godebog and it was wrongly assumed that this individual was Coel Hen. This brings me to the second element of my conjecture which is that the Godebog mentioned in the early documents was stating just the cognomen of Coel Hen’s father. So, my assertion is the pedigree runs thus:
Coel Hen m. Coel Godebog m. Tegfan.
These conjectures dovetail naturally with much of the other known genealogical information such as the dating of Cunedda Wledig as the husband of Gwawl f. Coel Hen as indicated by JC 20 7:
“Mam veibyon Cuneda oed Wawl verch Coyl hen.”
“Mother of the sons of Cunedda was Gwawl, daughter of Coel Hen.”
A later manuscript, ByA 27a appears to contradict this by suggesting Ystradwel f. Gadeon was:
“… gwreig i Goel godebawc hon oedd vam Dyfrwr a mam Genev ap Koel”
“… wife of Coel Godebog was mother to Dyfrwr and the mother to Ceneu son of Coel”