I don't know if there is any connection. We just recently discovered "our" William Tierney even existed. We don't know if he came to the US, following his brothers, stayed in Ireland, or went elsewhere. Felix is not a common name in the Tierney line, as far as we can tell. There is a Felix Tierney from Co Armagh of NI, who you can find in Griffiths Valuation, among other things. We don't know if our Felix is related to that one, or not.