ammā > ambā́ in other East Indo-European Languages (1)
According to Turner’s A Comparative Dictionary of the East Indo-Aryan Languages, Sanskrit word ambā́ means “mother.” He also presents the cognates of ambā́ in East other Indo-European languages and dialects:
Pali ambā-, ammā-, ambakā-; Aśokan abaka-; Middle Indo-Aryan forms occurring in Corpus Inscriptionum Indicarum aṁbaē; Prakrit aṁbā- aṁmā-, aṁmayā-, aṁbiā-, ama; Sindhī amā, amī. Lahndā, Panjābī, West Pahāṛī and Bhalesī (dialect of West Pahāṛī) ammā̃; Gaṅgoī (dialect of Kumaunī) āmā; Gaṅgoī (dialect of Kumaunī) ā̃m; Nepāli āmā; Assamese āmai; Maithilī amā̃; Hindī ammā; Sinhalese am̆buva.
All these cognates of ambā́ originate from the Tamil root ammā.