More info about the name "Oliver"
Oliver originates in Germanic and means "elf warrior". As a masculine given name, it came to English-speaking countries through the French name Olivier, and became quite rare after the 17th century due to one of the most controversial figures in British history, the military commander Oliver Cromwell. This tendency was overturned by the lovable character of Oliver Twist in the 19th century. It functions as a surname as well.