Green’s Dictionary of Slang

helly! excl.

also hellie!

a synon. for hell! excl.

[US]R. Fisher Conjure-Man Dies 160: ‘Hmph!’ Jinx grunted again. ‘Hmph hell-ie!’ returned Bubber.
[US]‘Iceberg Slim’ Mama Black Widow 79: Oh helly, ain’t nuthin’ happen.