Yes, there are several saints named Justina.
The name "Yostina" is derived from the Latin name "Justina." The names are the same, just pronounced differently. "Yostina" is the Arabic way of saying Justina. Another example of this is Jose, which is the Spanish version of Joseph. Justina (and Justine) come from the Latin name lustina, a derivative of lustus,which means fair or just. The masculine version of the Justina is Justin. There are two saints who were named Justina but the saint most likely named after for Yostina is Saint Justina of Antioch. You can find her story here: http://www.orthodoxinfo.com/death/cyprian_justina.aspx.
There are at least three saints named Justina and all were martyrs during the early years of the Church. No birthdate is known for any of these saints.
Justina = Iukina
giratina ( a Pokemon ) rhymes with Justina
Justina Headley was born in 1968.
Justina of Padua died in 304.
Justina Casagli died in 1841.
Justina Casagli was born in 1794.
Justina Vail is 5' 6".
Justina Hernik is 5' 8".
Justina Machado is 5' 2".
Justina Machado was born on September 6, 1972.