Paraskeva’s name day is July 26, the feast of Paraskevi the Great Martyr.
Churches that follow the Old (Julian) Calendar keep the same feast on August 8 of the civil calendar. See everything commemorated on July 26.
The saint behind the name

Paraskevi the Great Martyr
July 26, Martyr, Παρασκευή η Μεγαλομάρτυς
St. Paraskevi was born near Rome in the second century to devout Christian parents, who named her for the day of the Passion of the Lord, Friday, in Greek Paraskevi. After their death she gave her goods to the poor and went about preaching Christ, for which she was arrested; she endured torture with steadfastness and was finally beheaded, her witness, according to tradition, bringing even her persecutors to wonder.
Name days: Paraskeva, Paraskevas, Paraskevi, Paraskeve, Voula, Vouli, Vassoula, Evi, Vivi, Skevi
Also celebrating on July 26
These names share the feast, many of them other forms of the same name:
Paraskevas, Paraskevi, Paraskeve, Voula, Vouli, Vassoula, Evi, Vivi, Skevi
What to say on a name day
The Greek wish is Χρόνια Πολλά (Chronia Polla), “many years.” A call or a short message on the day is what people remember. See name day wishes you can send and what a name day is.