Dubnium named after Dubna a town in Russia where it was discovered. It’s a unstable radioactive transition metal, and has a half life in minutes. Much like other elements in the 100s is only used in high level radioactivity experiments.
Elephants never forget or so a certain saying goes. Elephants used to live all over Europe and Asia, including in Russia. Unfortunately human activity and environmental changes have caused it to become extinct in many areas it used to live. I felt elephants being heavy they would tie with a heavier elements, and so I decided to tie them to Dubnium.
Seaborgium is named after Glenn Theodore Seaborg who after his involvement in the Manhattan Project became one of the most strident proponents of nuclear arms control. He also was the co-discoverer of 10 elements and the use of iodine-131 in medicine for thyroid treatments.
Leafy Sea Dragons are a relative of the Seahorse that live on the south coast of Australia. They are very peaceful well camouflaged creatures. As Seaborg was a propensity of peacemaking I felt a peaceful Sea creature was best.