Yes, in some countries, people commonly refer to their vacuum cleaners as "Hoovers," regardless of the brand. This phenomenon is known as a generic trademark or proprietary eponym, where a brand name becomes so well-known that it becomes synonymous with the general product category.
The term "Hoover" originated from the Hoover Company, an American vacuum cleaner manufacturer founded in 1908. Hoover was a dominant brand in the early 20th century, and its vacuum cleaners gained widespread popularity. As a result, the term "Hoover" became commonly used in some countries, such as the United Kingdom, Ireland, Australia, and New Zealand, to describe any vacuum cleaner, regardless of the actual brand.
It's worth noting that the extent of this usage may vary between countries and regions. In some places, the term "Hoover" may be less prevalent, and people might use other words to refer to vacuum cleaners. Additionally, with time, the popularity of specific brands and their associated generic trademarks can change, so the usage of "Hoover" may evolve over time.