1600s handwriting: I predict a baptism

I wrestled with the name William Robert Jenkin Morton, born 1611.  Welsh patronymics told me that he was William son of Robert, son of Jenkin.  This Jenkin was born maybe in the 1570s and I didn't think he could become a grandfather that quickly.  And there was no evidence of this Robert or this William anywhere in the registers.

So I scoured the tree for another Jenkin who I knew did already have a son Robert, and found the guy at the top of the tree fitted.  But Robert was born eighty years before 1611 so couldn't be the father.  He did have an alleged grandson William, who would be William DAVID Robert Jenkin Morton that a baptism didn't seem to exist for.

Did I misread the baptism after all?  If I was right, then the two mysteries, a missing baptism, and an unknown family, could be replaced with one baptism that fitted a known individual?

So, I was in the strange position of going to read a baptism from 1611 knowing that I was going to spot an extra word between the 'William' and the 'Robert'.  And there it was..... 'dd' which is the shortened form of David that I'd completed ignored on the first reading.

William Robert Jenkin Morton was William David Robert Jenkin Morton which made much more sense, turning an impossible person on the family tree into someone who fitted perfectly.

It was very strange going to a baptism registers from the 1600s with open mind knowing what I was going to see, however.  Here is the entry courtesy of Carmarthenshire Archives.