@sandystrachan it’s 7 pounds referring to Shakespeare’s The Merchant of Venice the central character demands the payment of a pound of flesh from those who are in debt to him. The ‘pound of flesh’ refers to an onerous debt, one that is either unable to be paid (but demanded), one that is far in excess of the amount owed, or one in which the payment is set to adamantly exacting standards. Ben Thomas (Will Smith) has a debt to repay for the seven lives he took in a car accident, and so the phrase is both metaphorical and literal since six of the debts are repaid with his actual “flesh”. in some foreign releases, however, the title changes. For example, the French title is Sept vies (Seven lives), because the French for “seven pounds” is identical to “seven books” (both are “sept livres”), which would confuse audiences.
I found this here