Spanish urraca 'magpie'

The Catalan linguist Joan Coromines¹ derives Spanish urraca 'magpie (Pica pica)' from the female personal name Urraca², popular during the High Middle Ages in the Christian kingdoms of Northern Spain (Asturias/León, Castile, Navarre, Aragon). However, this hypothesis not only doesn't give us any insight about the etymology, but it also won't explain the initial consonant found in the dialectal variants burraca, furraca, hurraca /xuráka/, zurraca /θuráka/.

I'd link the Spanish word to Basque urra (B) 'expression to call hens and pidgeons; birds in general, especially hens and pidgeons' < *burra 'hen', with *bu > u³ like in Iberian. By contrast, Paleo-Basque, lacking of such a stop in its sound inventory, adopted it as /p/⁴, hence purra (G, HN, S, R, Z), furra (B, G, HN) 'expression to call hens', with the expressive variants tturra /cura/ (L, LN, Z), turra (L, LN). There's also Galician churra /tʃúra/ 'hen; expression to call hens'.

A diminutive form *burra-ka would be then the source of the forms burraca, urraca. In Spanish, the initial labial became a voiceless bilabial fricative *φ, variously reflected as /f/, /x/ or /θ/⁵. As in the case of most names of birds, the utlimate origin of this word would be onomatopoeic.

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¹ J. Coromines (1973, 2008): Breve diccionario etimológico de la lengua castellana, p. 564.

² There's also the Galician variant Orraca.

³ Possibly through an intermediate stage *wu.
⁴ Cfr. Asturian utre 'vulture' ~ Gascon botre, butre > Basque putre (G), futre (HN).
⁵ Spanish *φ became aspirated as /h/ (except before /l, r, w/) at an early date, although the aspiration was later lost in most dialects. This is why the genuine form must have been hurraca.