The distribution of G (along with E3b and J2) in Europe is considered to mark the trail of the Neolithic farmers from the Middle East who first brought agriculture into Europe about 9000 years ago. That distribution can be seen as the group colored in green in the map on the fourth page of King and Underhill's paper on Neolithic ceramics. The highest frequency of G is found in the Caucasus region where up to 30% of the men belong to haplogroup G. The distribution of haplogroup G in that area can be seen in the map on the second page of the study by Nasidze et al of Y chromosomes in the Caucasus region. Cinnioglu et al found 9% of the men in Turkey belonged to haplogroup G2. It is also seen through out the Middle East, and at a rate of about 5% in Italy and Greece.

The 2001 study by Bosch et al of Spanish and NW African Y chromosomes did not test the marker that defines the G clade (M201), so if G had been present it would have ended up classified inside the group FxIJK. It turned out that that about 6% of the Spanish were classified as FxIJK and the modal haplotype for those FxIJKs matched at 6 out of the 8 overlapping markers with the modal haplotype for G2 shown in the graphs below. (The Spanish FxIJK haplotype can be seen here). The Y Chromosome Census of the British Isles by Capelli et al did not test the marker M201 either, but they saw the FxIJK group at a frequency of 1-2% in many British towns.