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ALVES
Portuguese: the usual Portuguese form of Alvares
> Portuguese: from a patronymic form of the personal name Álvaro (see Alvaro)
> Spanish (Álvaro) and Portuguese: from the personal name Álvaro, which is of Germanic (Visigothic) origin, although the exact etymology is not clear.

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GRELL
1. nickname for an irritable, irascible person, from Middle High German, Middle Low German grellen ‘to be angry’.
2. habitational name from a place named Grelle.

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This is from: Dictionary of American Family Names, Oxford University Press

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The DUDEN, Familiennamen has:

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ALVES:
Lower German patronym of Alf

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GRELL:
1. from Middle High German "grel" (rough, angry)
2. from Middle High German "grelle" (stick, spear) for someone making or using a weapon of the kind

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So take your pick!