Because Arjuna's son was born on his relurn from exile during which he had achieved many celebrated feats, that child came to be called Shrutakarma.
श्रुतं कर्म महत् कृत्वा निवृत्तेन किरीटिना। जातः पुत्रस्तथेत्येवं श्रुतकर्मा ततोऽभवत्॥