Цветков (Tsvetkov) - Meaning "flower" or relating to flowers. This is a common and recognizable surname.

Цветочный (Tsvetnoy) - Meaning "floral" or "of flowers." Less common than Цветков, but still plausible.

Розанов (Rozanov) - Derived from "роза" (roza), meaning "rose." A relatively common surname with a clear floral connection.

Лилия (Liliya) - While technically a feminine given name, it could be adapted as a surname, particularly in a fictional context, referencing the lily flower. It might be used as Liliyna or Liliev.

Ландышев (Landyshev) - Derived from "ландыш" (landysh), meaning "lily of the valley." This is a less common but still authentic-sounding surname.

Подсолнухов (Podsolnukhov) - Derived from "подсолнух" (podsolnukh), meaning "sunflower." This surname is less common but carries a strong floral association.

Василькова (Vasilkova) - Derived from "василёк" (vasilek), meaning "cornflower." This is a feminine surname, but could be adapted for a male character by changing the ending.

Максимов (Maksimov) - While not directly meaning "flower," it is derived from "мак" (mak), meaning "poppy," a type of flower. This is a very common surname, so its floral connection might be less immediately apparent.

These are just a few examples, and the best choice will depend on the specific context and desired level of commonality. Remember that surnames can have multiple origins and meanings, and some might be more regionally specific than others.