No it is not. The surname is known in Bedfordshire in England as early as the 15th century.
Like many English surnames, migrant Jews adopted this name, because it may have been similar to their own Jewish surname, in an attempt to hide their origins and escape prejudice. Because the name is an uncommon English surname, the number of Jewish descendents is now significant enough for people to assume it is a Jewish name. This is particularly true within parts of the USA, such New England, where natrualised migrants were Jewish families rather than "real" Brightmans of Enlish origins.
Lucy Brightman's birth name is Lyndall Brightman.
Yes, she has some Jewish heritage from her father, but as the Jewish linage goes on down the female line, no Sarah is not Jewish.
Virginia Hudson Brightman's birth name is Virginia Tyler Hudson.
Violet Affleck's birth name is Violet Anne Affleck.
Thomas Brightman died in 1607.
Thomas Brightman was born in 1562.
Jerry Brightman was born in 1953.
Is wife of Augustus Brightman. She moved from Dnepropetrovsk to US for marry to him in 2008. Miss her here.
Yes it was called "Him" by Sarah Brightman
Samuel C. Brightman was born in 1911.
Samuel C. Brightman died in 1992.
Edgar S. Brightman died in 1953.