Isa.

Isaiah.

British Dictionary definitions for isa (1 of 2)

ISA 1
/ aeronautics /

abbreviation for

International Standard Atmosphere
Interim Standard Atmosphere

British Dictionary definitions for isa (2 of 2)

ISA 2
/ (ˈaɪsə) /

n acronym for

individual savings account: a tax-free savings scheme introduced in Britain in 1999