Pokemon name meaning:
ビーバー bĩbã – beaver
出っ浦 deppa – protruding tooth, overbite, bucktooth
Regular Pokemon species-mixing as this Pokemon is officially called a “plump mouse Pokemon” while its name refers to beaver. Cf Horubee (both rabbit and wallaby), Gekogashira (both frog and gekko) etc. Of course these creatures are Pokemon, not mice, frogs or rabbits – the earth-like names are only reference-points for you earthlings.