Really puzzled that Senan not considered an Irish name! If its derived from Sean does that not still make it Irish?
I had a Google and it keeps appearing under Irish names!
Senan
Gender:MaleMeaning of Senan:"old, wise"Origin of Senan:Irish, variation ofSean
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Senan Origin and Meaning
The nameSenanConnected with the Latin word meaning 'senator,' this started as a nickname, used as a term of respect. St. Senan was a famed founder of monasteries, whose ruins can still be seen. Legend has it that before he could found it, he had to banish a great monster. Other versions are Sionan, Sinan, Synan and Sinon. Seanan is also a pet form of Sean
59th in Ireland (2018)
Famous People Named Senan
SenanMolony, Irish newspaper editor