NOTICE: By using this website, registering and logging in to this site I agree to abide by the terms of local, national and international intellectual property rights, trade secret law, and copyright and will not mine data from this site including private information entered by members for the purpose of sale, resell, rent, loan or distribution of content . I agree to not alter content entered by members and understand that violating any of these rules will result in immediate banishment from the database and may result in violation of infringement laws. This is a research project and the information entered is for the purpose of tracing surnames by end location numbers found on chromosomes, establishing patterns of relationships relative to those numbers and for collaboration between database members in discovery of family lines and relationships. Information found in the database is permitted for personal use and collaboration with other database members who are part of the research project. This discovery method, "Chromosome Mapping by End Location Number" website and database are the intellectual property of Wanda M. Pierce (c) 2016

To be able to do this, you will need to have a kit called "Family Finder", available from familytreedna.comThis method can be used with other chromosome browsers, but currently, the only way to determine the end location number with other DNA companies, like Gedmatch, is to compare the data (end location number, chromosome number, cM and SNPs) from FTDNA's chromosome browser to their chromosome browser for a match. Each DNA company uses different Algorithm's for matching so they do not match each other unless you know what to look for. Family Finder is the best company for using this method because their algorithm matches surnames to chromosomes.  This method "Chromosome Mapping by End Location Number (Pierce 2016) matches surnames to end location numbers, which is more precise.

After you login to Family Finder (an autosomal DNA kit from, click on matches and you will see this below.

Step One:

Enter the surname you are researching. Be sure to try different versions for the most or best results. Google the surname first; to find out the old versions, alternate versions and the modern versions of that surname. Google: Surname...and the surname you are researching.

Step Two:

Click the little square box next to the people who have listed that surname in their tree.

Step Three:

Click on the chromosome browser button and it will open up in a new tab and show you where you match with everyone on chromosomes.

Step one.PNG

Step Four:

Click on the red bar that says "Compare".

Step two.PNG

Step Five:

Click on the drop down bar that says 5cM and select 1cM.

Step Six:

Click on "Download Segments" and it will download a CSV file to Excel or Open Office. 

Step three.PNG

After you have download all your matches for a surname, copy and paste all your results into one spreadsheet. Do not copy the header's, just the data below.

Step Seven: 

Click on "Sort & Filter" in Excel.

Sort and Filter.PNG

Step Eight:

Select Sort by End Location from the drop box.

Sort by end location number.PNG

Step Nine:

Select Sort by Chromosome Number.

Sort by chromosome.PNG

After you have finished sorting your matches by end location number, you will be able to pick out sets of 3 matches as shown below, highlighted in yellow. These matches are important because they show an IBD autosomal DNA inheritance by Surname. You can slide the bars over to see more information by clicking on the horizontal lines in the head section and moving them. You will want to see the entire name of your match as research is next. Below are 3 matches found on chromosome 11 for surname Welles/Wells.

Matching End location Numbers for Welles in Excel.PNG

Step Ten:

Time to check out your matches tree. In the example below, I was searching for surname Graves. By clicking on the tree icon highlighted in yellow on the left, a new page will open up showing you your matches tree.

Look in tree.PNG

Step Eleven: 

Inside your cousins tree you will find a search bar with a magnifying glass symbol. This is where you can type in the surname you are researching. Not everyone will have posted their gedcom. They may have just listed the surname. You can contact them or just post "No Tree" if they didn't. If they listed the surname and it matches others with the surname who have tree's it's still a good match. You can type that person's ancestor in your Excel or other file for your research. To see an example of successful research showing ancestors related by the same end location number, scroll up to the top of this page to view examplesofchromosomemapping

Search in matches tree.PNG


To search by surname, click on matches on the left and go to the beginning of these instructions.

To research surnames and end location numbers, download all your matches as follows.

Step One All Matches:

To download all your matches, click on chromosome Browser.

All Matches.PNG

Step Two Download all Matches:

Click on Download all Segments. This will download as a CSV file, you can open in Excel or Open Office. Excel works better. After download, follow steps 7-9. Then look at the Surname-List page surname-list and pick a surname you think is an ancestor of yours.  

Step Three:

Login to the database (you must be a member to use the database. Instructions are on the home page) and you can search by surname, chromosome number or end location number or any combination for results. The end location number must have 3 exact matches for every single digit to the surname to be valid if new or match a surname/end location number already found in the database.

All Matches Download.PNG

Chromosome Mapping of Ancient Bloodlines (c) 2016 Wanda M Pierce

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