For Eurostar travel, your ticket name should ideally match the Machine Readable Zone (MRZ) of your passport, but Eurostar is generally more lenient than airlines regarding middle names. While the "Advance Passenger Information" (API) you submit before travel must include your full legal name exactly as it appears on your passport, the name printed on the actual ticket often only requires your first name and surname. If your ticket says "John Smith" but your passport says "John Michael Smith," you will almost never have an issue at the gate. However, if you have a very common name or are traveling to a country with heightened security protocols, including the middle name provides an extra layer of verification. The most critical rule is that your surname and first name are spelled correctly; Eurostar explicitly states that minor spelling mistakes or the absence of a middle name on the ticket itself will not prevent you from traveling.