孙Sūn
A short first-tone surname; do not infer family ties from a famous bearer.
A historical connection
Sun Yat-sen is one historical bearer of 孙; his English form shows that romanized names can vary by context.
The named reference here is Sun Yat-sen. It gives a point of entry into history; it cannot establish the origin or genealogy of everyone who writes this surname.
What to check in your own name
Say the whole name aloud, including its surname/given-name boundary. Check the surname’s tone and whether the next syllable begins comfortably. If your family already uses a Chinese surname, use its own documented written form and reading instead of replacing it with an attractive historical story.
These combinations are exploration examples. Only the linked dossier’s original surname pairing has its specific editorial note; a changed surname needs fluent-speaker review.
Sources & limits
Sources support the specific facts cited above. An editorial name interpretation is not an ancient quotation or proof of family ancestry.