Namesakes
Fictional Characters from Television:
2 characters
Ross Geller (a.k.a. Eustace) 1994 Friends 
Paris Geller (a.k.a. Eustace) 2000 Gilmore Girls
Saints:
3 saints
Saint Eustace ?-118
Saint Evstati of Mtskheta (a.k.a. Eustace) ?-c. 550
Saint Eustace White ?-1591
Shakespearian Characters:
1 character
Lord Capucius (a.k.a. Eustace) Henry VIII