updated my original post, 100% we absorb some Western Malayo-Polynesian early on around 5th century ad.Sxb that could be a factor but we tend to forget Somalia is on the most eastern edge of Africa and we have historically lineage of people who were seafarers and trades men. We even gave Chinese king a giraffe. There where even Chinese pottery found in Puntland. I think this by itself could give way to evidence of Chinese people settling in Somalia and eventually genetically mix with the locals. The crazier thing is Somali a general nomads and these gende could have spread all over