Have you ever wanted to use the sound that in Spanish is spelled with a J?

That's all very good and well, but what happens when you have a word that ends in the Spanish 'J' sound? For example, Gerinogh (spelled with the 'gh' as you can see). I'm not sure it would work very well with just the 'h'.

I think we're talking past each other here ... in my (admittedly limited) experience with Spanish, the "Spanish 'j' sound" is precisely an aspirated 'h' sound. (For example, "rojo" is pronounced "ro-ho".) There's no *consonant* there at all, and I can't imagine how you would *pronounce* a word that somehow ended with that sound (the equivalent letter in English is, like I said, 'h', and in English words that end with that letter, the 'h' is silent), so for me *spelling* its pronunciation would be impossible.

Okay, so I don't know what aspirated means...

Linguistics. To pronounce (e.g., a vowel) with the release of breath associated with English h, as in he.

I'm not a language expert.

Ugh...how can I say this right...? How about a recording of pronunciation to illustrate the sound I mean, for lack of a better way?

That would work.
What dialect of Spanish do you speak? Maybe that would help. I'm sure you could find a sound byte somewhere on the internet of the sound you want.

There is a supposedly-standard syntax for writing out pronunciations, called the International Phonetic Alphabet. (And there's a variant designed for cases like this, where you can't change to the IPA font.) Unfortunately, it's more or less opaque nonsense to amateurs, and to the best of my knowledge I have yet to meet anyone who can actually read it.