jeep
Refers to the vehicle brand or generically to a small, rugged four-wheel-drive vehicle. Used as a common noun in Japanese.
彼はジープで山道を走った。
He drove a jeep on the mountain road.
The soldiers moved by riding in a jeep.
父は休みの日にジープを運転して山道を走る。
On his days off, my father drives his jeep on mountain roads.
jeepney
Loanword from English 'jeep', originally a brand name.