I'm having a tough time making pronunciation guides so they are approximate.
French forms: Césarie (say-sah-REE) and Césarine (say-sah-REEN)
In
France Césarie was used 80 times between 1900 and 2003 and Césarine was used 1620 times between those years including 3 times in 2003.
Polish forms: Cezaria (tseh-ZAH-ryah) and Cezaryna (tseh-zah-RIH-nah)