He is of one quarter British Isles (English, Northern Irish, remote Welsh), one quarter Ashkenazi Jewish (from Latvia and Poland), one quarter Algerian-Kabyle, and one quarter German, descent.
Half-brother of Barnabé Nuytten (born on 1979), Ronan Cal Day-Lewis (born on 14 June 1998) and Cashel Blake Day-Lewis (born in May 2002).
His father Daniel Day-Lewis was the first non-American actor to win two Academy Awards for best actor.