"There is little information about Muhammad in the Qur’an. The word “Muhammad” appears 4 times in the Qur’an. In three of the cases it could merely refer to a title, “the praised one,” or “chosen one.” Other names like Abraham appear 79 times, Moses 136 times, Pharaoh 74 times. The title “messenger of Allah” appears 300 times. Surah 33:40 is certainly a reference to a person, but it tells nothing about the life of Muhammad. Surah 48:29 also names Muhammad as a messenger of Allah" - Robert Spencer.
If there is little information about Muhammad in the Qur’an, where then did the name "Muhammad" come from? According to the available numismatic evidence, the name "Muhammad" first appeared, around 8th Century CE, in a coin that's minted by Abd al Malik (the 5th Umayyad Caliph). Abd al Malik coined the term "Muhammed(um)" as a phrasal commendation, meaning "praise be." The question is: praise be to who or what? It's "praise be" to Isa Ibn Maryam(Jesus), who, in direct protest to the Byzantium Church of Rome, was considered by the Monophysites/Nestorian Christians (I.e. the Umayyad) to be Abd Allah (I.e. servant of God) and Al Wali Rasul Allah (I.e. exalted messenger of God) and not Ibn Allah (I.e. the son of God) as claimed by the Byzantium Church of Rome.
The three phrases "Muhammed(um)," "Abd Allah," and "Al W(Ali) Allah," were transformed to proper names, around 9th Century CE, by the 7th Abbasid Caliph (Al Mamun) after he had usurped the Umayyad dynasty. Consequently, the phrase "Muhammed(um)," which originally meant "praise be," was redacted to a proper noun "Muhammed," and subsequently historicized as the Arabian prophet. Similarly, the phrase "Abd Allah," which originally meant "servant of Allah," was transformed to a proper noun "Abdullah," and subsequently historicized as Muhammed's biological father. Lastly, the phrase "Al W(Ali) Allah," which originally meant "exalted servant of Allah," was transformed to a proper noun "Ali," and subsequently historicized as Muhammed's son-in-law.
For simplicity, the three aforementioned phrases can be illustrated with the following formulas:
Muhammed(un) (praise be to Isa Ibn Maryam) =Muhammed (Arabian Prophet/Christ).
Abd Allah (servant of Allah)=Abdullah ("Muhammed's father").
Al W(Ali) Rasul Allah (exalted messenger of Allah)=Ali (Muhammed's "son-in-law").
The Sassanid aristocrats of Iran adopted the last formula, which is the root of Sunni-Shia schism, today. And while some non-Arab Muslims can recite certain prayer words in the Quran, majority of them do not understand Arabic. Hence, their ignorance about the historical origin of Islam.