RWY INCURSION BY A BE90 PLT WHEN ANSWERING TO THE WRONG CALL SIGN AT ORD; IL.

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TAXIED AS INSTRUCTED TO RWY 4L; HOLDING SHORT OF RWY. RPTED 'READY; RWY 4L.' SOME MOMENTS LATER; TWR CALLED US AS I EXPECTED. I READ BACK EXACTLY AS I HEARD; 'ACFT X; TAXI INTO POS; RWY 4L AND HOLD.' I PAUSED AND THERE WAS NO RESPONSE; SO I TAXIED ONTO RWY 4L AT 'TXWY W.' AFTER SITTING FOR SEVERAL MOMENTS; THE TWR AGAIN CAME ON AND SAID; 'ACFT X; CLRED TO GO RWY 4L; WITH R TURN TO 090 DEG HDG.' I READ BACK INSTRUCTIONS BUT STRESSED THAT IT WAS MY FLT NUMBER. TWR THEN SAID; 'HOLD UP.' I ASKED IF THEY WANTED ME TO CLR THE RWY. TWR RESPONDED; 'NO; BUT THAT IT WAS SUPPOSED TO BE BONANZA ABBKB; ON THE RWY; NOT KING AIR ABBKB.' I WAS THEN CLRED TO DEPART; AND THEN ADMONISHED BY TWR TO 'LISTEN UP' IN THE FUTURE. AT NO TIME DID THE TWR ADVISE THAT THERE WERE SIMILAR SOUNDING CALL SIGNS AT THE SAME RWY; NOR DID HE PREFACE THE CALLS WITH 'BONANZA;' OR 'KING AIR' TO HELP DIFFERENTIATE. ALSO THE CTLR WAS TALKING FAST AND THE XMISSION WAS SLIGHTLY 'SCRATCHY.' AS HE MADE THE CALLS I EXPECTED; AND I READ BACK; SLOWLY AND CLRLY; AND GOT NO OTHER RESPONSE; I FOLLOWED WHAT I HEARD THE INSTRUCTIONS SAID TO DO.