Any instance in the pali canon where a sotāpanna born as a human? According to the Theravada Buddhism, a sotāpanna can be born in 7 existence in kama-loka which includes human realm.


  Yê ariya saccâni vibhâvayanti - gambhira paññnêna sudêsitâni, 
  Kincâpi tê honti bhusappamattâ - na te bhavam attamam âdiyanti, 
  Idampi sanghê ratanam panîtam - êtêna saccêna suvatthi hôtu.
  
  Those who realized the Noble Truths well taught by him who is profound in wisdom (the Buddha), even though they may be exceedingly heedless, they will not take an eighth existence (in the realm of sense spheres).This precious jewel is the Sangha. By this (asseveration of the) truth may there be happiness.
  
  -- Ratana Sutta Verse 9


Is there any such instance in the pali canon, in the commentaries or in any Buddhist culture?
AN 3.87 didn't provide any specific instance but in this sutta, the Buddha talked about 3 grades of stream enterers from low to high:

...Having undertaken the training rules, he trains in them. With the utter destruction of three fetters, he is a seven-times-at-most attainer who, after roaming and wandering on among devas and humans seven times at most, makes an end of suffering;
With the utter destruction of three fetters, he is a family-to-family attainer who, after roaming and wandering on among good families two or three times, makes an end of suffering;
With the utter destruction of three fetters, he is a one-seed attainer who, after being reborn once more in human existence, makes an end of suffering.