After doing further research, I learned that haplogroup D is relatively rare, with a relic distribution, and only occurs:
In Andaman Islanders (in the Bay of Bengal, east of India - actually closer to Burma than to India - with D* at a frequency somewhere between 50 and 70%),
In Tibetans (with combination of D1 and D3 at about 50%),
In Japanese (with D2 about 35% in general, and higher than 85% in Ainu),
In medium to small percentages in other parts of mainland Southeast and East Asia, especially among speakers of Tibeto-Burman (such as Qiang with D1 at 30%), Hmong-Mien aka Miao-Yao (such as Yao with D1 at about 10%), and Daic aka Tai-Kadai languages (such as Thai with D* at 10%),
In tiny percentages in southern Central Asia (primarily as D3) among Mongolians, Altaians, Kazakhs, and Uzbeks,
and in small or tiny percentages of Pacific Islanders (as D*), such as Guam. Note that Guam is listed in a research paper with D* at 17%, but this was one person with a positive result out of six persons tested.
The areas where haplogroup D populations exist tend to be mountainous or oceanic, reflecting their displacement as first glacial ice, and then expanding Neolithic populations, displaced them from more fertile areas. Whether they moved voluntarily and opportunistically to exploit the more remote areas, whether Neolithic populations pushed them into ever-shrinking and more remote territory, or whether they were simply outnumbered by the sheer number of Neolithic people in fertile areas, is open to conjecture. It was probably a combination of factors that led to their remote, fragmented distribution and shrinking numbers.
Where D is found at high frequencies:
D* - SNP M174 - typically Andamanese; more specificaly, in the Jarawa and Onge people.
D1 - SNP M15 - typically Tibetans and those nearby who speak a Tibeto-Burman language. Probably originated in Southeast Asia and migrated into Tibet from the east about 5000 years ago. SNP N1 defines D1a.
D2 - SNP M64.1 - originated in and occurs almost exclusively in Japan, especially among Ainus and Ryukyuans. SNP M116.1 defines D2a.
D3 - SNP P99 - typically Tibetans and those nearby who speak a Tibeto-Burman language. Originated in or migrated into Tibet about 11,000 years ago. SNP P47 defines D3a.
Haplogroup D is an ancient haplogroup, descended from DE with which it shares the YAP+ marker not found in any other haplogroups, and probably originated in South Asia about 60,000 to 50,000 years ago.
According to the Genographic Project,
, though curiously not in India.Haplogroup D may have accompanied another group, the Coastal Clan (haplogroup C) on the first major wave of migration out of Africa about 50,000 years ago. Taking advantage of the plentiful seaside resources, these intrepid explorers followed the coastline of Africa through the southern Arabian Peninsula, India, Sri Lanka, and Southeast Asia. Alternatively, they may have made the trek at a later time, following in the footsteps of the Coastal Clan. Pockets of these ancestors still live along this ancient route, particularly in Southeast Asia and the Andaman Islands
This first major wave (or waves) of migration are known as the Great Coastal Migration or the Coastal Express.
The haplogroup-D Pacific Islanders belong to paragroup D (D*) with the Andamanese. This is the oldest branch, before the subclades D1, D2, and D3 branched off. I haven't been able to find a research paper describing which Pacific Islanders have D* and at what frequency, other than one paper showing 16.60% D* in Guam. (Again, note that this was only ONE person who tested D* out of 6 persons tested.) I did find another research paper with an image showing Pacific Ocean Islanders clustered near Andaman Islanders in the D paragroup, but with no further mention of who these Pacific Islanders were or where they resided. I'm thinking that the frequency is generally low since there is not even any mention of haplogroup D on Wikipedia's Y-DNA haplogroups in Oceanian populations page.
The D man from Guam who matched Martin 12/12, and 4 steps away at 25, has Chamorro ancestors, according to his daughter who contacted me.
Martin also matches one man in Luzon, Philippines on YHRD.org at 7 loci (no matches at more than 7 loci).
On a side note, I think Martin has one or more RecLOHs:
I've ordered Y-STR DNA-FP Panel 5 Palindromic Pack out of curiosity, to look deeper into his RecLOHs and understand what is going on.
Currently my fiancée and I are testing Martin for SNP M174 to confirm haplogroup D. We are also testing M15, M64.1, and P99 to see if he belongs to subclades D1, D2, or D3, respectively. (There are other SNPs associated with each subclade. The ones I listed are among those you can test at FTDNA.) Our prediction is that he will come back either D* or D1/D3, as there is no evidence of any Japanese ancestry in his family. Furthermore, he doesn't match anyone on Ysearch where there are plenty of D2 entries. His closest matches are GD of 7 at the 12 marker level.
Martin and his family live on Mactan Island. This is in the Ibabao Cordova section of Cebu City, near Mactan-Cebu International Airport and near Lapu Lapu where Magellan met his end in 1521. They tell me that all of their ancestors, for as far back as they can remember, came from the same general area. Who knows? There could be more haplogroup D men in Ibabao Cordova.
If you are D* or you know someone who is, or if you are Filipino and your last name is DOROY, please contact me. Thank you!