Many Romanian surnames have the suffix -escu or (less commonly) -aşcu which corresponds to the Latin suffix -iscus and means "belonging to the people". For example, Petrescu used to be Petre's son. Similar suffixes such as -asco, -asgo, -esque, -ez, etc. are present in other Latin-derived languages.
Many Romanians in France changed this ending of their surnames to -esco, because the way it is pronounced in French better approximates the Romanian pronunciation of -escu. Other suffixes are -eanu (or -an, -anu), which indicates the geographical origin and -aru (or -oru), which indicates an occupation.
The most common surnames are Popa ("the priest")—almost 200,000 Romanians have this surname—Popescu ("son of the priest") —almost 150,000 have this name— and Ionescu ("John's (Ion's) son").