The tag only accepts a number. You could use POI to get the
sheet number.
<cfscript>
fis = createObject("java",
"java.io.FileInputStream").init("c:\yourFile.xls");
wb = createObject("java",
"org.apache.poi.hssf.usermodel.HSSFWorkbook").init(fis);
sheetNumber = wb.getSheetIndex("Sheet1");
fis.close();
</cfscript>
<cfx_ExcelQuery action="read" file="c:\yourFile.xls"
sheet="#sheetNumber#" variable="myQuery" />