Sárnait, also known as Surney of Drumacoo or Sourney, was a 6th-century Irish saint. Surney was an associate of Colman mac Duagh, who was the bishop of the locality at the time. Her background is unknown, but may have been a name of Uí Fiachrach Aidhne like Colman. Her floruit is estimated from Colmán mac Cobthaig to Guaire Aidne mac Colmáin. Surney was the founder of the church of Drumacoo, in the parish of Ballinderreen, County Galway around 550. A later medieval church, now disused, now stands on the site of the original foundation. The adjoining graveyard is still in use.