Details about Vitz / Yaris nameplate change:
Up to 2019, Toyota had used the Yaris nameplate on export versions of various Japanese-market models, with some markets receiving the same vehicles under the Toyota Echo name through 2005. Starting in 2020, the Yaris nameplate began to be used in Japan, which replaced the Vitz nameplate. The Yaris nameplate has also been applied to other vehicles as well. Since 2020, the nameplate has also been used for the subcompact crossover SUV offering called Yaris Cross.
In Japan, a sharp drop in sales prompted Toyota to rebrand the Vitz as Yaris in order to expand its middle-aged customer base.
(Sources: https://en.wikipedia.org/wiki/Toyota_Yaris and https://en.wikipedia.org/wiki/Toyota_Yaris#Fourth_generation_(XP210;_2020) )
Throughout its production, the name "Vitz" nameplate had been used consistently in Japan, with most international markets received the same vehicle under the Toyota Yaris name, or formerly as the Toyota Echo in some markets for the first generation.
The "Vitz" nameplate was discontinued in Japan in 2019 for the "Yaris" nameplate based on XP210 model. The nameplate change is due to sharp drop in sales.
In Japan, a sharp drop in sales from a height of 160,000 a year to 87,000 prompted Toyota to rebrand the Vitz as Yaris in order to expand its middle-aged customer base.
(Source: https://en.wikipedia.org/wiki/Toyota_Vitz and https://en.wikipedia.org/wiki/Toyota_Vitz#Third_generation_(XP130;_2010) )