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There are mainly 2 issue.

1. Your Registration.php is placed at wrong place Currently it is placed at

   Vendor/Siteinfo/etc/registration.php

it should be:

Vendor/Siteinfo/registration.php

2. Wrong Vendor name is defined in registration.php

3. Wrong Vendor name in module.xml

   Please follow below

   Create

   app/code/Vendor/Siteinfo/registration.php

    <?php
    \Magento\Framework\Component\ComponentRegistrar::register(
        \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'Vendor_Siteinfo',
    __DIR__
    );
   

   app/code/Vendor/Siteinfo/etc/module.xml

    <?xml version="1.0"?>
    <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="Vendor_Siteinfo" setup_version="1.0.0">
    </module>
   

   app/code/Vendor/Siteinfo/Block/Storeinfo.php

    <?php
    namespace Vendor\Siteinfo\Block;
    class Siteinfo extends \Magento\Framework\View\Element\Template
    {    
    public function __construct(
        \Magento\Backend\Block\Template\Context $context,        
        array $data = []
    )
    {            
        parent::__construct($context, $data);
    }
   
    /**
     * Get store identifier
     *
     * @return  int
     */
    public function getStoreId()
    {
        return $this->_storeManager->getStore()->getId();
    }
   
    /**
     * Get website identifier
     *
     * @return string|int|null
     */
    public function getWebsiteId()
    {
        return $this->_storeManager->getStore()->getWebsiteId();
    }
   
    /**
     * Get Store code
     *
     * @return string
     */
    public function getStoreCode()
    {
        return $this->_storeManager->getStore()->getCode();
    }
   
    /**
     * Get Store name
     *
     * @return string
     */
    public function getStoreName()
    {
        return $this->_storeManager->getStore()->getName();
    }
   
    /**
     * Get current url for store
     *
     * @param bool|string $fromStore Include/Exclude from_store parameter from URL
     * @return string     
     */
    public function getStoreUrl($fromStore = true)
    {
        return $this->_storeManager->getStore()->getCurrentUrl($fromStore);
    }
   
    /**
     * Check if store is active
     *
     * @return boolean
     */
    public function isStoreActive()
    {
        return $this->_storeManager->getStore()->isActive();
    }
    }
    ?>
   

   app/code/Vendor/Siteinfo/view/frontend/templates/storename.phtml

    <?php echo $block->getStoreName(); ?>
   

   After that you need to run:

   php bin/magento setup:upgrade

   php bin/magento cache:flush