Cynog

Of uncertain origin and meaning. Current theories include a derivation from Welsh cyn "chief" and the diminutive suffix -og. Saint Cynog was allegedly a son of Brychan Brycheiniog.

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http://kimkat.org/amryw/1_enwau/enwau_bedydd_cymraeg_geiriadur_1_1265e.htm
https://en.wikipedia.org/wiki/Cynog
https://en.wikipedia.org/wiki/Cynog_Dafis
https://en.wikipedia.org/wiki/Cynog_ap_Brychan
https://www.linkedin.com/pub/dir/Cynog/+

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(Information from name #234924 originally submitted by user LMS)