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Setup:

export VAR_ONE=thisIsVarOne

An alternative using an associative array:

$ unset      newvar
$ declare -A newvar

$ newvar[${VAR_ONE}]="somePrefix${VAR_ONE}"

$ typeset -p newvar
declare -A newvar=([thisIsVarOne]="somePrefixthisIsVarOne" )

$ echo "${newvar[${VAR_ONE}]}"
somePrefixthisIsVarOne