It’s a Japanese Pormanteau.
ビックリード・ドラゴン Bikkulead Dragon (Shocklead Dragon)
Bikkuri is a similar term used for the name of the second core booster for Rush Duels: 驚愕のライトニングアタック!!. Bikkuri is Surprise/Amazement/Frightening/Astonishing. The Pack’s term is Suprise/Fright/Shock/Astonishment.
