C172 PLT IFR ON A PLEASURE FLT IS ASSIGNED DIRECT TO AN UNFAMILIAR FIX BY RIC APCH.

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WE WERE CONDUCTING AN IFR FLT TO RIC. WE WERE CLRED DIRECT RIC BY THE IAD APCH CTL. WE WERE THEN HANDED OFF TO RICHMOND APCH. 5 MINS LATER; AND STILL 60 NM FROM RIC WE WERE CLRED DIRECT TO JESTY INTXN. THE ACFT HAS AN IFR CERTIFIED GPS; WE FILED '/G' FOR AN EQUIP CODE; AND THE AUTOPLT WAS ENGAGED AND SLAVED TO THE GPS FOR NAV. I WAS NOT FAMILIAR WITH 'JESTY;' AND I REQUESTED A SPELLING CLARIFICATION. THE RICHMOND APCH CTLR RESPONDED USING THE PHONETIC ALPHABET; HOWEVER; THE TONE OF THE RESPONSE INDICATED I SHOULD HAVE KNOWN HOW TO SPELL IT. REALIZING THAT I SHOULD REVIEW MY FLT PREPARATION; I TOOK THE TIME FOLLOWING THE TRIP TO LOOP UP THE INTXN. JESTY IS AN FAF ON THE ILS RWY 2 APCH. THIS FIX IS NOT PART OF THE ENRTE STRUCTURE; AND IS ONE OF MANY FIXES ON THE 12 INST APCH PROCS AT RIC. FINALLY; THIS FIX IS ONLY USED FOR THE ILS RWY 2 APCH. I AM FILING THIS RPT FOR SEVERAL REASONS. EVEN THOUGH SAFETY WAS NEVER A FACTOR DURING THIS FLT; I THINK IT COULD BE IN SITS WHERE THE APCH CTL FREQ IS VERY BUSY; AND/OR THE FLT IS A BIT CLOSER TO THE DEST AND THE AIRSPACE IS BUSIER. IT IS ALSO UNREASONABLE; I THINK; TO EXPECT PLTS TO KNOW ALL OF THE INTXN NAMES; ESPECIALLY THOSE THAT CANNOT BE LOCATED ON THE CHART RELEVANT TO THE FLT OP BEING CONDUCTED (ENRTE VERSUS APCH). DURING THE CONDUCT OF THE FLT; TRYING TO GUESS THE FIX SPELLING COULD BE A SIGNIFICANT PROB IN HIGH WORKLOAD PORTIONS OF FLT. THE DELAYS IN PROCEEDING ON THE EXPECTED COURSE COULD CAUSE ISSUES FOR PROPER ACFT SEPARATION.