No, according to some historical beliefs, a single sneeze is considered unlucky.
Ancient Superstitions and Sneezing
Historically, the number of sneezes held significance in some cultures. One or three sneezes were seen as bad omens, discouraging further action. Conversely, two or four sneezes were interpreted as positive signs, encouraging the continuation of planned activities. This belief is evidenced by the statement: "If, in undertaking any business, two or four sneezes happened, it was a lucky omen, and gave encouragement to proceed; if more than four, the omen was neither good nor bad; if one or three, it was unlucky, and dehorted them from proceeding in what they had designed."
Modern Interpretations and Cultural Variations
While these ancient superstitions are largely not followed today, beliefs about the luck associated with sneezing vary across cultures. Some cultures hold no specific belief about the luck associated with the number of sneezes, while others may have different interpretations not connected to the number of sneezes at all. For example, some believe sneezing before a journey is unlucky in certain cultures. The belief in "luck" associated with sneezing is largely anecdotal and varies depending on cultural background and personal beliefs.
Conclusion
The modern understanding of sneezing is predominantly medical. It's a reflex response, typically triggered by irritants, and not a predictor of good or bad luck. While cultural beliefs surrounding sneezing and luck continue to exist, the evidence supporting this association is based solely on tradition and not scientific fact.