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French word lorsque comes from French que, French lors ((obsolete) then, at that time.)
que (French)
(used with ne) only (ne ... que parses roughly as "(do[es]) not / nothing ... other than"). Links two noun phrases in apposition forming a clause without a (finite) verb, such that the complement acts as predicate.. Substitutes for another, previously stated conjunction.. That (introduces a noun clause and connects it to its parent clause). When, no sooner. Than (introduces a comparison) [...]
lors (French)
(obsolete) then, at that time.
lorsque (French)
When (at a time when).