In the first clip, Agnes's surname definitely begins with an A, just more squashed that the one at the start of "Agnes" (perhaps because the clerk was coming to the end of the line). The index to Scotlandspeople gives it as "Aleman", but it looks more like Alemar. Certainly the last letter does not look like the other examples of final n. Could well be an r with a flourish.
I have looked in the minutes of Coldingham kirk session, but no mention there. There are no minutes for Duns kirk session on Scotlandspeople for that period. Nor are there minutes available there for Duns in 1744 to see what was said about the birth of the twins.
Spellings were very variable and I would not be surprised to find versions of Agnes's surname starting with an A or an E, in the same way that the surname "Alexander" can appear on the same page as "Elshenor".