FTDNA Y-tree branch

Haplogroup A-BY813

A-BY813 is a branch of the FamilyTreeDNA Y tree with 50 kits that gave a country, counting all sub-branches. It is most common in these samples: United States (0.1% of kits). The branch's common ancestor lived about 8,400 years ago: the FTDNA Discover estimate runs from 7,100 to 9,900 years ago. YFull has 10 samples in this branch and dates its common ancestor to 9,300 years ago.

Compare with another branch →

This branch on other trees: FTDNA Discover ↗ · YFull ↗

Branch SNPs: 28 · 14 more at YFull

BY813, BY1874, BY2036, BY31659, FT1299, FT232724, FT32420, V2069, Y17313, Y7969, Y7996, Y8026, Y8239, Z11350, Z11353, Z11386, Z11395, Z11399, Z11409, Z11414, Z11419, Z11433, Z11434, Z11437, Z11448, Z11451, Z11467, Z11471

The same mutation arose again on other branches: Y7996 — J-FT14660; Z11467 — R-Y32770

YFull nodes on this branch and their SNPs that FTDNA does not have:

A-V3893 · A-FT195435 · 3 samples
A35863
A-Z11380 · A-Z11380 · 2 samples
Z11472, Z11343
A-BY1081 · A-BY1075 · 1 sample
Y41009, Y40362, Y243111
A-Y429 · A-Z11371 · 1 sample
Z11397, Z11403, Z11352
A-Y7944 · A-BY1240
Y8050, Z11396
A-Y7969
Y8220, M8209/CTS1422/MF37552, M8496/Z11376
A-FT32398 · A-BY1075 · 3 samples

kits with a country

sub-branches included; 108 kits in the branch in all, 58 without a country

on the branch itself

with a country, the test did not resolve a sub-branch; 10 on the branch itself in all, those without a country included

43%

Big Y

46 of 108: every kit of the branch with sub-branches, those without a country included

sub-branches

0 with their own page, 2 without

116

samples at FTDNA Discover

58 with a country; the public tree has 108 kits

8,400 years

age by Discover

the common ancestor lived 7,100 to 9,900 years ago

9,300 years

age by YFull

common ancestor (TMRCA); the branch split from its parent 9,500 years ago

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.

Colour is the branch's share of the country's kits. Hover over a country or tap it.

Where it is found
Country / region	kits	Share of branch	Share of country
United States	45	90.0%	0.1%
Algeria	1	2.0%	1 of 506
England	1	2.0%	1 of 27,808
Scotland	1	2.0%	1 of 14,213
United Kingdom	1	2.0%	1 of 9,747
United States (Native American)United States	1	2.0%	1 of 1,833

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.

Also 1 small sub-branch of under 5 kits: 2 kits in all. On the branch itself, without a resolved sub-branch: 1 kit.

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.

A-BY1240 47 kits 4,400 years United States 43, England 1, Scotland 1
A-BY1075 40 kits 400 years United States 37, England 1, Scotland 1
A-BY31569 25 kits 300 years United States 24, England 1
A-BY235938 5 kits 300 years United States 4, England 1
A-FTJ9911 5 kits 200 years United States 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.

FTDNA Discover common ancestor8,400 years (7,100–9,900)

YFull A-Y7969 common ancestor9,300 years (7,900–10,700) · 10 samples

FTDNA Discover split from the parent10,200 years (8,700–11,900)

YFull A-Y7969 split from the parent9,500 years (8,300–10,800) · 10 samples

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

Across: years ago; up: number of sub-branches, log scale. The shaded band marks the period when the count multiplied most; the last thousand years are left out.

Sub-branches of the last centuries show up only where many relatives have tested. So the right end of the curve, red included, 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.

Y-DNA, FTDNA

new kits, 2026-10-02 → 2026-11-02

Where it grew

without a country: 1

United States: +1

Surnames #

Surnames that testers entered at FTDNA, over the whole branch with its sub-branches: 4 distinct among 38 kits. FTDNA gives surnames per branch only, with no country attached, so they cannot be split by country.

Bass 31
Wright 3
Boxx 2
Quick 2