When we first saw the names Belonger and Blonger, we assumed, as you may have, that they were pronounced like the word “longer“. It’s hard to tell because the name is very nearly unique, but the evidence suggests three options:
We use what we believe to be the Americanized pronunciation, which rhymes with conjure.
If you’re feeling French, give it that continental sound, blohn-zhuh.
Or if you’re a cheesehead, you may say like some still say Belonger in the old home town, be-lahn-jee.