There are several synonyms for the phrase "every last one". These words and phrases convey the same meaning and can be used interchangeably depending on the context. Some of the synonyms include "every single one", "each and every one", "every individual one", "every one of them", and "all of them without exception". Using these synonyms can help to diversify and enhance the language used in writing or speaking. It can also prevent repetition and make communication more clear and concise. By using synonyms for "every last one", one can convey a wealth of meaning and infuse more variety and nuance into their language.