I came across some info- it has been mentioned in this genforum discussion about Maryland Cecil's. It is not sourced but I decided to be open minded and look at it. It would suggest that it goes William Cecil (Lord Burghley), Thomas, Thomas (engraver of MD map and famous English people),William (who is immigranted with brother John and maybe Henry), William born 1665, etc. William son of THomas First Earl of Exeter became Second Earl- his younger brother Thomas is said to be the engraver. The common ancestor of the Earls and the line that ended up in Maryland is Thomas- First Earl of Exeter- . Keep that in mind when analyzing the DNA info about genetic distance. Also keep in mind that sometimes genetic distance can be off a little or a lot. I run the Singer surname DNA group on familytreedna.com (same company that has the Cecil DNA results). It has been my experience that when having two branches from a common ancestor- genetic distance can still be off. In our case two of our Singer's come from the same Singer in 1750- but one shows that he is several generations removed from that common ancestor. Since we know the lineage it has helped us to understand that the one Singer is slightly different and the results show a greater genetic distance than is actually true.