Descent as a “Lamont” seems uncertain.
From https://www.familysearch.org/en/tree/person/details/LDMY-5LD, “alert notes.”
The Lamont DNA Project shows that this Young family is of Y-DNA haplogroup R-BY108407. Another group also claims an Andrew Lamont Young but it of R-Y19360 and is not related. That group seems far more developed than this one.
https://www.familytreedna.com/public/LamontDNA?iframe=ydna-results-...
The Young DNA Project shows the same but is cleaner to read.
“I have never seen any real-world evidence that this family is of the Lamont family. Only uncited trees. Otherwise, nothing.”