By golly, bless my brolly, Rousepeteur posting again! Oh, happy day!
parapluie, gamp, umbrella! You're an extra welcome fella!
Parasol, that's not all! No parachute? Don't try a bumbershoot!
Here's what Quinion said:
http://www.quinion.com/words/qa/qa-bum2.htm