GND CTLR AT STL ISSUED RWY CROSSING INSTRUCTIONS TO WRONG ACFT.

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ACR X; JS41; HOLDING SHORT OF RWY 30L AT TXWY B. ACR Y ANOTHER JETSTREAM MAINT; HOLDING SHORT OF RWY 30R AT G TXWY. ANOTHER MAINT TAXI ACFT ALSO WAS HOLDING SHORT OF RWY 31. WHILE AWAITING N LOCAL TO GIVE ME CLRNC TO CROSS RWY 30R AND RWY 31 WITH THE ACR Y; I WAS FORMULATING MY PLAN ON ALL MY CROSSINGS. WHEN LCL GAVE ME CLRNC TO CROSS; I MUST HAVE HAD JUST THOUGHT OF ACR X'S PLAN ON HIS CROSSING OF RWY 30L. I WAS INTENDING TO CROSS RWY 30R AND RWY 31 WITH THE ACR Y I SAID 'ACR X; CROSS RWY 30R AND RWY 31 TAXI TO...' WHEN I HEARD THE READBACK; IT TOOK A SECOND FOR THE 'ACR X' TO SINK IN AND THEN I REALIZED THE WRONG ACFT WAS MOVING. AS I STARTED TO TELL HIM HE TOOK THE WRONG CLRNC. I NOTICED HE WAS GOING OUT ONTO THE RWY AND I TOLD S LOCAL TO CANCEL THE DEPARTURES TKOF CLRNC. I DID NOT THINK I HAD SAID 'ACR X'; BUT REVIEW OF THE TAPE CONFIRMED I HAD. REVIEWING THE SCENARIO; I HAD GOTTEN TOO FAR INTO PLANNING AND WHEN IT CAME TO IMPLEMENTING; I DID NOT USE MY PAD TO UPDATE MY THOUGHTS. SUPPLEMENTAL INFO FROM ACN 518761: AFTER LNDG ON RWY 30R AT STL; I WAS TOLD TO HOLD SHORT OF 30L AT TXWY BRAVO; WHICH I DID. SHORTLY THEREAFTER; GND CTL SAID 'ACR Y (WHICH WAS OUR CALLSIGN) CROSS 30R' AT WHICH TIME I CLRED VISUALLY AND STARTED ACROSS THE RWY. ONCE ON THE RWY; GND INFORMED US 'THAT CLRNC WAS NOT MEANT FOR US.' I CLRED THE RWY AND TAXIED TO PARKING. GND CTL GOT US MIXED UP WITH ANOTHER ACFT AT ANOTHER INTXN.