Traditional family christian names
These names with their widespread use among all branches of the family make it impossible to decide in many cases without other confirmation the connections betweensiblings.I am just adding this as general information
John, this is the name preferred for the head of the family in the senior line and in use right across all branches as the familys most popular name.
James, used since 1412 and the name of the second head of the family in Scotland. Nearly as popular as John
Alexander, used on a regular basis since Alexander Trails son James married Mariote Wemysses daughter Of Alexander Wemysses of Kilmenie. One of their sons was a popular poet in the time of James III in 1455 also named Alexander.
David. the Traills first became invovled in Scottish affairs in the time of David the first. However did not start using David irregularly across several families as a good name for younger sons after the Traills married in to the Wemysses family in the 15th and 16th centuries at least twice. David as well as John were favoured names of the Wemysess family.
William dates back to the 13th century.
Robert appears at least twice in different lines where a Traill marries a Robertson and continues in those lines George favoured by the Holland line of the Orkney Traills
Thomas also favoured by this family.