comment_author( int|WP_Comment $comment_id )

Source

function comment_author( $comment_id = 0 ) {
	$comment = get_comment( $comment_id );

	$comment_author = get_comment_author( $comment );

	/**
	 * Filters the comment author's name for display.
	 *
	 * @since 1.2.0
	 * @since 4.1.0 The `$comment_id` parameter was added.
	 *
	 * @param string $comment_author The comment author's username.
	 * @param string $comment_id     The comment ID as a numeric string.
	 */
	echo apply_filters( 'comment_author', $comment_author, $comment->comment_ID );
}

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