Ambiguous tag. Originally an archaic Japanese reading for 砂/沙/砂子 (suna, "Sand").
For the artist formerly tagged here, see Isago (Lop) or Isago (Sprout).
For some potential artists named Isago: isago_* search | *_isago search
Also try: 135_* search | *_135 search because "135" can be read as "I(chi)-SA(n)-go" in Japanese.