Use custom post author name from ACF field

Hello,

Thank you for reaching out to us and bringing your concern to our attention.

Please note that WordPress always refers to the post’s actual author who published that post and usually the theme handles how it displays on the article page (bio section).

However, if you meant to change the author schema, we do have a filter for you to modify the author schema. Please refer to this example filter code:

add_filter( "rank_math/snippet/rich_snippet_article_entity", function( $entity ) {
	global $post;
	$entity['author']['@id'] = 'https://rankmath.com/#person';
	$entity['author']['@type'] = 'Person';
	$entity['author']['name'] = get_field('YOUR_FIELD_NAME', $post->ID);

	$author_imageData = [
		"@type" => "ImageObject",
		"@id" => "http://domain.com/your-path-to-your-image.jpg",
		"url" => "http://domain.com/your-path-to-your-image.jpg"
	];
	$entity['author']['image'] = $author_imageData;
	
	return $entity;
});

You may refer more about this filter hook here: https://rankmath.com/kb/filters-hooks-api-developer/#change-post-schema-data

Hope that helps and please do not hesitate to let us know if you need my assistance with anything else.