Lookup value is wrong

is the list in 'Individual names'!E20:E102 sorted ascending? as required for lookup to work?
if not then use index match instead

=index('Individual names'!D20:D102,match(D26,'Individual names'!E20:E102,0))

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I'd go with INDEX/MATCH

=INDEX('Individual names'!D20:D102,MATCH(D26,'Individual names'!E20:E102,0))

Are the names placed in Column E set in Ascending order?

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