Русско-англо-русский юридический словарь

Heir typically has an older and more familial connotation, though it is still used. Usually only for particularly powerful or wealthy people though. "She was the heir to her father's estate." Inheritor is a legal word that means the designated person set to inherit, or receive a person's belongings after they die. (HiNative)

"Inheritor" sounds like a very legal term. I've never heard it outside of that context. Anyone that receives proceeds from someone's estate is an inheritor. An heir is usually the person that receives the lion's share of an estate. (HiNative)

"Heir" and "inheritor" both mean "the person who will inherit something", but "inheritor" can also mean "the person who inherited something" and "the person who inherits an attribute". One is only the heir until the time that the inheritance takes place - but one is the inheritor both before and after. (The Free Dictionary Language Forums)

Inheritors are individuals who are to be given at least some portion if not all of the estate of an ancestor upon the ancestor’s or benefactor’s death as stated by the ancestor’s or benefactor’s will. [...] However, an individual could also even "inherit" said estate even if there was not a will, but only if those individuals were the legal heirs. Heirs are not necessarily always the same as inheritors. Inheritors are those who are specified in the will and who inherit the estate. Heirs are individuals who inherit the estate of the deceased individual if the deceased did not leave behind a will. (Legal Information Institute)

If an estate owner fails to suggest an inheritor in their will, or if there is no known next of kin, the asset falls into the hands of the Crown and is managed by the treasury solicitor (Mirror)

Because they remain married, his wife was both an inheritor of his $20 million estate and was named to handle administration of his estate. (Central Arizona Estate Planning Council)

Only digital content for which the deceased holds the copyright may be passed down to an inheritor. (Wikipedia)

Soon after her husband's death, Mrs Nyakumabor's father-in-law called a family meeting, told her to choose an inheritor and ordered her to be cleansed by having sex with a fisherman. (BBC)

If a family member passes away and you inherit their IRA or 401(k), it can be challenging to determine how to proceed. The situation can be variable depending on your connection to the deceased. Radio host and finance consultant Dave Ramsey recently looked at your best choices for what to do with an inherited retirement account, as this can be a difficult time in an inheritor’s life. (Yahoo Finance)

I became the sole inheritor of all Darlene Snell's estates and holdings. (TV series "Ozark")

Mark Mateschitz, one of the world’s youngest billionaires and the heir to Red Bull, received a $615 million shareholder payout from the company this month, according to Bloomberg, his first payment since inheriting the Austrian energy drink giant from his late father, Dietrich Mateschitz, last year. (Forbes)

The heir of the energy drink empire who struck and killed a police officer has yet to face charges. (BBC)

Thailand's attorney general has ordered a new investigation into the heir to the Red Bull energy drink fortune over the hit-and-run killing of a policeman. (BBC)

The owner of an $11 billion fashion fortune says he plans to adopt his 51-year-old gardener and make him the official heir to a portion of his riches from the Hermès dynasty, multiple outlets reported, adding Nicolas Puech to a list of the extremely wealthy making surprising decisions about where to bequeath their fortunes. (Forbes)

An heir to the Fiat fortune is facing court in New York after allegedly faking his own kidnapping. (BBC)

His destiny was thrust upon him when he was just 28 by the deaths of his grandfather, the great Italian industrialist Giovanni “Gianni” Agnelli, who named Mr Elkann as his heir, and his great-uncle Umberto Agnelli, within little more than a year of each other. (Financial Times)