Based on the latest discoveries out at the R-L165 DNA project, it looks like we are closer to discovering a marker for direct male-line descent from Leod!
Right now what is known:
Y-DNA Haplogroup R1b, marked by the SNP marker M343, originates about 16,500BC (Paleolithic)
Marker M269 originates about 4500BC (Bronze Age, Yamnaya culture, located on the Pontic Steppe & Between Black and Caspian Seas
Middle Bronze Age large scale migration to Europe, Marker P312 originates about 3500BC (Bell Beaker Culture; Proto-Italo-Celto-Germanic)
Marker DF27/S250 (Ibero-Atlantic Celt Branch) > Marker Z195/S355 > Marker Z198 > Marker L165/S68 originates probably 3000-2000BC>
L165 divides into a group that later becomes MacNeils of Barra, Lindseys and Buies of Jura, some MacDonalds, and at least one Norwegian (>BY129/130/131/132/133/134/135/Y5114/R-BY132) and another, FGC29987 /BY456 (origin not certain, but before 600AD) which later gives rise to Leod about 1229AD