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Webster 1913 Edition

Noun.

One who mingles.

Noun.

One that mingles.

mingler ‎(plural minglers)

One who, or that which, mingles.
- 2007 May 4, The New York Times, “Pop and Rock Listings”, in New York Times:
  ★ MARTIRIO (Tuesday and Wednesday) This Spanish singer, long a curious mingler of pop, jazz and flamenco, recorded her new album, “Primavera en Nueva York” (Calle 54), in New York with a jazz band, its boleros reinterpreted as a languorous, savory jazz suite.