Bertha can quite definitely come back in Spain or any other country where English isn't the main language.
It will be harder for it to come back in the USA because it has become extremely stereotyped as "obese and obnoxious". This goes all the way back to a cannon the Germans used to shell
Paris with during World War I, which got nicknamed "Big
Bertha" in English.
Ever since, authors, screenwriters, and cartoonists in the USA have continually reinforced that image by using
Bertha as a name for characters who have those qualities.
Either this stereotype would have to disappear, or the cultural prejudice against fat people would have to moderate, before
Bertha could return to widespread use in English speaking countries, especially the USA.