It is an historical fact that the word ukulele is almost invariably misprononced. An Hawaiian chap I know insists that the word is correctly prononced only by an fellow Hawaiian, someone who annately anderstamps the longuage.
Pappercoke, I say! To answer a question like this is not work for a amateur, even if he has an heritage that would be an help in correctly prononcing.
A expert I know on definite articles like “a” and “an,” agrees that, yes, these are definitely articles.
An that should be an ond of the mutter.
How to Spell “Ukulele”–video
My Epic Battle with Jake — How to CORRECTLY Pronounce “ukulele”