Do the funds for the Thailand marriage visa have to be transferred from abroad?

They don't care where it comes from. Has to be in thai bank account for 2 months before applying.

There is nothing in the rules governing the issuance of Non-O visa for marriage or the year extension based on marriage that says the funds must come from abroad.

Only that they're in a thai bank in your name and in the case of the extension the funds are seasoned in that account for 2 months before you apply..

I do not know of an immigration office that requires proof the funds originated from abroad for the initial 90 day Non-O visa based on marriage.