English
lvalue
From L + value, where L stands for left-hand side (of an assignment).
Proto-Indo-European *h₂welh₁- ‘to be strong’
…
Latin valeō ‘to be strong, be worth’
Old French valoir
Old French value
Middle English valew
English value
The story
In the context of the C programming language it is sometimes re-explained as locator value.
Today it means
noun A value that can be treated as an address or storage location.
Language periods are conventional ranges, not dates for this word.
Etymograph / lvalue