Prominent English translations of the Holy Quran that render the phrase specifically as “Seal of the Prophets” include:

In the Quran (Surah Al-Ahzab, 33:40), the Arabic phrase خَاتَمَ النَّبِيِّينَ (Khatam an-Nabiyyin) is translated directly as “Seal of the Prophets” (or “seal of the prophets”) in several widely recognized English translations.

Abdullah Yusuf Ali (The Holy Qur’an: Text, Translation and Commentary)
“Muhammad is not the father of any of your men, but (he is) the Messenger of Allah, and the Seal of the Prophets: and Allah has full knowledge of all things.”