Allen is a very common surname, but here is a list of some of the most common clades of ALLEN in the Y-chromosome tree, shown with the names used in our index (based on the names from the FtDna Allen/Allin/Allan/Alleyne project, shown in parentheses). I list these groups in approximate decreasing order of frequency, based on occurrences (shown in parentheses) in that Allen project.

- ALLEN-YYIA "I Subgroup a" (50) I2-PF4088
- ALLEN-YYRD "R Subgroup d" (50) R-BY12512/R-ZZ10.1 England
- ALLEN-YYRC "R Subgroup c" (25) R1b-FGC14874
- ALLEN-YYRS "R Subgroup s" (25) R1b-S4052 England?
- ALLEN-YYRE "R Subgroup e" (18) R1b-L20 England
- ALLEN-YYGA "G Subgroup a" (16) G-Z1816 Scotland

This G clade may derive from "Sarmatian" mercenaries fighting in Britain as Roman sldiers (see King Arthur hypotheses). Their affiliation with Alan tribe may have led to an ALAN surname. - ALLEN-YYRN "R Subgroup n" (15) R1b-S764
- ALLEN-YYRZM "R Subgroup zm" (14) R1b-FGC22184
- ALLEN-YYIX "I Subgroup x" (12) I2a-P37
- ("R Subgroup l") (12) R1-M173 (no downstream SNP shown) Scotland?
- ALLEN-YYIE "I Subgroup e" (11) I1-P109
- ALLEN-JAMIE "R Subgroup g" (11) R1b-FGC17354 Scotland (Jamie's group!)
- ALLEN-YYRM "R Subgroup m" (9) R1b-Z36 Scotland?
- ("R Subgroup q") (8) R1b-P312 (no downstream SNP shown) Scotland?
- ("R Subgroup u") (8) R1b-M269 (no downstream SNP shown)
- ("R Subgroup x") (6) R1b-M269 (no downstream SNP shown)
- ("R Subgroup z") (6) R1b-M269 (no downstream SNP shown) Scotland?
- ALLEN-YYJX "J Subgroup x" (5) J2-Y5009
- ALLEN-YYRY "R Subgroup y" (5) R1b-A6910
- ALLEN-YYIH "I Subgroup h" (5) I1-Y11267
- ("R Subgroup sz") (5) R1b-L21 (no downstream SNP shown)
- ALLEN-YYEA "E Subgroup a" (4) E-FGC11450
- ALLEN-YYRI "R Subgroup i" (4) R1b-A294
- ALLEN-YYRZH "R Subgroup zh" (3) R1b-BY2588 Scotland
- ALLEN-YYRYG "R Subgroup yg" (3) R1b-S5456
- ALLEN-YYRTB "R Subgroup yb" (2) R1b-S6941

There are eleven ALLEN clades shown at
R.org.
Of these, ALLEN-YYRC and ALLEN-YYRZM have two hits each at R.org;
ALLEN-YYRZH, ALLEN-YYRD and ALLEN-YYRY have one hit each.
The other six Allens at R.org are in clades
Z8191, S271, CTS5396, A1338, BY3726, Z17591 of R1b.
These six are not shown on this page but *are*
listed under Allen
in the Index.