Du'a using Allah's Name Ar-Razzaq

اللَّهُمَّ يَا رَزَّاقُ وَسِّعْ أَرْزَاقَنَا

Allahumma ya Razzaqu wassi' arzaqana

O Allah, The Provider, expand our sustenance.

A general supplication, not a narration from the Prophet (peace be upon him).