get_cat_name( int $cat_id )

Source

File: wp-includes/category.php

function get_cat_name( $cat_id ) {
	$cat_id   = (int) $cat_id;
	$category = get_term( $cat_id, 'category' );

	if ( ! $category || is_wp_error( $category ) ) {
		return '';
	}

	return $category->name;
}