Proto-Germanic *trūwāną

→ English trow (inherited)

→ Danish tro (inherited)

→ German trauen (inherited)

→ Old Swedish troa (inherited)

→ Gothic 𐍄𐍂𐌰𐌿𐌰𐌽 (inherited)

→ Old Norse trúa (inherited)

→ Swedish tro (inherited)