Haplogroup T-Y21017
T-Y21017 is a branch of the FamilyTreeDNA Y tree with 53 kits that gave a country, counting all sub-branches. It is most common in these samples: Saudi Arabia (0.3% of kits), Netherlands (0.2% of kits). The branch's common ancestor lived about 5,900 years ago: the FTDNA Discover estimate runs from 5,000 to 7,100 years ago. YFull has 42 samples in this branch and dates its common ancestor to 5,500 years ago.
Belongs to the T-M184 branch, which has a note.
This branch on other trees: FTDNA Discover ↗ · YFull ↗
Branch SNPs: 30 · 26 more at YFull
Y21017, FGC65019, FGC65024, FGC73933, FGC73937, FGC73938, FGC73942, FGC73952, FGC73953, FGC73960, FGC73965, FT106447, Y151377, Y21018, Y21333, Y21334, Y21335, Y21336, Y21337, Y21338, Y21339, Y21340, Y21341, Y21342, Y21343, Y21344, Y21345, Y21347, Y21348, Y21349
The same mutation arose again on other branches: FGC73960 — R-FGC73960; Y21333 — R-FT395557; Y21334 — R-FTD37992, J-FTA81707; Y21335 — E-CTS749, G-FT404360; Y21344 — R-FT355485, R-BY76120; Y21345 — R-FT115167
YFull nodes on this branch and their SNPs that FTDNA does not have:
- T-FT249235 · T-FT249235 · 3 samples
Y527149, Y527150 - T-FT359248 · T-FT359248 · 2 samples
Y530312(H) - T-Y60900 · T-CTS2442 · 2 samples
Y527172, Y527167, Y527169(H), Y527170, Y527165(H), Y527166(H), BY215216, Y527174, Y527175(H), Y527168(H), Y527173(H), Y503378(H) - T-FT460079 · T-FT460079 · 1 sample
Y527143 - T-Y21017 · 1 sample
Y527162, Y503379(H), Y527142, Y527144, Y21350 - T-Y91924 · T-FGC65000
BY230356/TY32522, Y527145(H), Y527146(H), Y527148(H) - T-FT389453 · T-FT388323 · 5 samples
- T-FT218613 · T-FT218613 · 4 samples
- T-FT274236 · T-FT274236 · 4 samples
- T-Y54695 · T-Y54695 · 4 samples
- T-FTA87373 · T-FTA87373 · 3 samples
- T-FGC65023 · T-FGC65023 · 2 samples
- and 10 more
Where it is found #
Countries and regions given by the branch's carriers. “Share of branch” is the part of the branch's kits that belongs to the country. “Share of country” is the part of that country's kits that falls into the branch; it is computed only for countries with at least 50 kits.
Where the ancestors of FamilyTreeDNA geographic project members on this branch lived, from the project maps as of 2026-10-20. Colour is the branch's share of the members at a place, or the number of its carriers; places with fewer than three are left blank. The centre and the 68% circle are corrected for some countries testing more than others. This is a picture of the sample: members chose whether to join and which place to give.
| Country / region | kits | Share of branch | Share of country |
|---|---|---|---|
| Saudi Arabia | 42 | 0.3% | |
| Netherlands | 5 | 0.2% | |
| Iraq | 2 | 2 of 3,216 | |
| Kuwait | 2 | 2 of 2,266 | |
| Azerbaijan | 1 | 1 of 614 | |
| Germany | 1 | 1 of 17,572 |
Sub-branches #
Sub-branches that have their own page (50 kits or more), as a tree: every direct one, nested ones from 1% of the branch's kits. The bar is the kits in the sub-branch with its own sub-branches; the age is when its common ancestor lived.
No sub-branch has its own page: only small branches lie below.
On the branch itself, without a resolved sub-branch: 5 kits.
Sub-branches without a page #
Each of these sub-branches has fewer than 50 kits with a country, so none has its own page. Below are all with 5 or more kits, with their age and top countries.
- T-FT99306 48 kits 5,700 years Saudi Arabia 42, Iraq 2, Kuwait 2
- T-FGC64999 46 kits 4,700 years Saudi Arabia 42, Iraq 2, Kuwait 2
- T-FGC65000 39 kits 700 years Saudi Arabia 37, Kuwait 2
- T-BY31209 36 kits 500 years Saudi Arabia 34, Kuwait 2
- T-Y144085 29 kits 400 years Saudi Arabia 29
- T-BY227119 17 kits 300 years Saudi Arabia 17
- T-FT216318 7 kits 200 years Saudi Arabia 7
- T-Y213960 9 kits 300 years Saudi Arabia 9
- T-FT460079 5 kits 200 years Saudi Arabia 5
- T-FT388323 5 kits 100 years Saudi Arabia 5
How old the branch is, by source #
Each source's estimate on one scale, in years ago. A dot is the estimate, a bar its spread (a 95% interval for YFull); no bar means the source publishes no spread. The “common ancestor” rows show when the last common ancestor of all carriers lived, the “split” rows when the branch broke off from its parent. Discover does not estimate the split, so its row shows the age of the parent branch itself.
How the branch grew #
How many sub-branches already existed at each moment: a sub-branch counts from the time its common ancestor lived (FamilyTreeDNA Discover estimates). Sub-branches with a known age: 23.
explosive growth: the number of sub-branches doubles in under 400 yearsgrowth: the number doubles in 400–1,500 yearsstagnation: no doubling within 1,500 yearsgrey: fewer than 5 sub-branches at the start of a stretch — too little to tell the rate
Sub-branches of the last centuries show up only where many relatives have tested, so the right end of the curve says more about who took a test than about population growth.
New this month #
FTDNA: how much the kit count grew between the tree copies of 2026-10-02 and 2026-11-02. A kit that moved to a new sub-branch after refinement is not counted as new. YFull: samples YFull itself marks as new, in the copy of 2026-11-02; YFull drops the mark after a few weeks.
Where it grew
without a country: 1
- Saudi Arabia: +5
New Y-DNA samples in YFull
- T-FT218613 · Ash Sharqiyah
Surnames #
Surnames that testers entered at FTDNA, over the whole branch with its sub-branches: 2 distinct among 7 kits. FTDNA gives surnames per branch only, with no country attached, so they cannot be split by country.
- Hendrix 4
- الرشيد 3