I can not tell you this exactly as you want,The most close to this is: έφυγε αλλά δεν θα ξεχαστεί which means he\she is gone but he\she will not be forgotten.
"Gone but not forgotten" in Italian is "andato ma non dimenticato".
"Never to be forgotten", dodhearmadta is Irish (Gaelic). Scottish Gaelic: ?
Gone But Not Forgotten - 2005 TV is rated/received certificates of: Australia:M Netherlands:12 Portugal:M/12
The Titanic is gone but not forgotten.
Frasier - 1993 Forgotten But Not Gone 8-18 was released on: USA: 17 April 2001
Everything's Relative - 1987 Forgotten But Not Gone 1-7 was released on: USA: 1987
NFL Films Presents - 1967 Gone But Not Forgotten was released on: USA: 28 January 2013
Xechasate
bisexucles
The cast of Days Gone Not Forgotten - 2011 includes: Stacy Bloxsom as Punk girl Leila Laaraj as Lana
Frasier - 1993 Forgotten But Not Gone 8-18 is rated/received certificates of: Canada:PG (video rating)
My Favorite Martian - 1963 Gone But Not Forgotten 2-23 is rated/received certificates of: Australia:G