For this Cahal Brendan there are 2 different names on Yasni.
In the ranking of the most common first names Cahal Brendan is on position 4589.
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Male first name (English, Irish); (?) Brendan Prince, Old Irish (Word format); from the Latinized form 'Brendanus' of an old Irish name 'Bréanainn', perhaps with the meaning 'Prince', known by the Saint. Brendan, a famous Irish monk (6th century)