Wikipedia and FamilySearch Record Search say that Pendeulwyn is the Welsh name for Pendoylan, so that baptism looks likely. Other baptisms of the same parents (or at least, parents of the same name in the same place)!
John 25 Aug 1821, died 2 Sep 1821
Margaret 7 Sep 1822
Mary 14 Jul 1824
Anne 24 Jul 1826
Mary 17 Aug 1834
Evan 10 Apr 1842
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