Three-syllable transliteration mapping to surnames or place-names with a 'Stam-/Stan-bo-' or 'Stam-burg' shape — possible source words include Stamberg, Stamboul (Istanbul), or compound names.
史丹 is a common 'Stan-/Stam-' opener (see also
史丹佛 Stanford,
史丹利 Stanley);
博 ('broad, learned') is a graceful closing-character favored in male names.