Final answer:
Jefferson urged senators not to speak the names of other members while engaged in debate to promote civil discourse, avoid personal attacks, and maintain a productive environment.
Step-by-step explanation:
Thomas Jefferson urged senators not to speak the names of other members while engaged in debate because he believed it would promote a more civil and respectful discourse. By avoiding personal attacks or mentions, senators could focus on the substance of the arguments being made. Additionally, by keeping the focus on ideas rather than individuals, Jefferson hoped to prevent animosity or grudges from developing among senators, fostering a more productive and cooperative environment.