Rashi on Exodus 37:1/רש"י על שמות ל״ז:א׳

1ויעש בצלאל AND BEZALEL MADE [THE ARK] — Because he gave himself over to the work more whole-heartedly than the other wise men it is called after his name (his name alone is associated with the act) (Midrash Tanchuma, Vayakhel 10).